Glossary Of Vietnam Terminology
Agent Orange - Defoliant/herbicide containing 2,4,T Dioxin
AK47 - Soviet/Chicom 7.62mm Kalashnicov assault rifle
Albumen - a blood expander carried by medics to replace lost blood
AN/PRS-4 - Mine detector used by combat engineers
AN/PVS-2 - Smaller Starlight Scope for use on individual weapons
AN/TVS-2 - Larger Starlight Scope for use on crew-served weapons
AO - Area of Operations, your "neighborhood". Ours were Cochise-Green & Walker
APC - Armored Personnel Carrier, usually an M-113
APDS - Armor Piercing Discarding Sabot -The baddest antitank round on earth
ARA - Aerial Rocket Artillery - gunships
Arc light - Radio code for a 3 ship Cell B-52 Strike
ARVN - collection of non-hostile South Vietnamese with weapons
Ash and Trash - Administrative functions of HHC
AVLB - Armored Vehicle Launched Bridge (usually on an M-60 tank chassis)
AW - Automatic Weapons
B40 - armor defeating shaped charge projectile fired by RPG2 and RPG7; origin unknown .
Band-Aid Box - Radio code for the medic vehicle, usually an M-113 APC .
Band-Aid - Radio code for the medic .
Baseball Grenade - Defensive Fragmentation hand grenade: explodes on impact .
Base Camp Commando - See REMF
Base Piece - howitzer closest to the battery center, fired first round of fire mission
BDA - Bomb Damage Assessment - we counted the craters
Beaucoup - Many
Beehive Round - 90mm cannon round containing 8,500 darts or "flechettes" called "Green Can"
Bic - Vietnamese for "understand" "No bic" means "I don't understand"
Big Boy - Radio code for a tank
Black Can - 90mm Canister round containing 1,000 1/2x5/16 inch pellets
Blivet - huge rubber tire-like container for water or diesel fuel: towed or airlifted
Blue Legs - Infantrymen
Blue Line - Radio code for a stream or river
BMFIC - Big Mother F***er In Charge (Usually the Division Commander or ADC maneuver)
Boom-Boom - sex with a prostitute
Boom-Boom Girl - A prostitute
Box - Radio code for an M-113 APC
Break Brush - To travel off a trail to avoid mines and booby-traps
Break Squelch - To press the transmit button on the radio handset
Broken Arrow - Radio code for a unit about to be overrun; diverts all Tactical air to support that unit
Bug Juice - Insect Repellent
Bug out - get out of the area
C4 - Plastic Explosive in Claymores we used for heating coffee
C and C - Command and Control Ship, usually a Huey, sometimes a Loach
CAR-15 - Carbine version of M-16 with collapsible stock - Officers and Special Forces only
C Rats - C-Rations. Dog food left over from WWII and canned for GIs in Nam
Charlie - Viet Cong, from phonetic alphabet for VC, Victor Charlie
Charles - Formal reference to Charlie
Charm School - Initial training and orientation upon arrival in-country
Cherry Juice - Hydraulic fluid in tank turret traversing system
Cherry School - Initial training and orientation upon arrival in-country
Chieu Hoi - Literally "Open Arms" - RVN Amnesty program for NVA/VC
Chinook - a CH-47 cargo helicopter
CIB - Combat Infantryman Badge (a mark of honor among grunts, justifiably so)
CIDG - Civilian Irregular Defense Group - Usually Montagnard tribesmen led by U.S. advisers, usually Green Berets
Claymore - antipersonnel mine (from Gaelic "claidheamh mor" pronounced like "Claymore" meaning Broad Sword)
Class 1 - Rations, usually hot
Class 2 - Individual equipment
Class 3 - Fuel
Class 4 - Barrier material and construction supplies
Class 5 - Ammo
Class 6 - Booze (hard liquor)
Class 7 - Medical supplies
Class 8 - Sundries; Coca-Cola, snacks, cigarettes, most common items found in a PX
Class 9 - Spares
Co-ax - the coaxially mounted M-73 7.62mm machine gun
Cockadau - derivative of Vietnamese slang, meaning, "to kill"
Coke Girl - a Vietnamese woman who sold everything except boom boom to GIs
Concussion Bomb - A bomb containing kerosene that was devastating
CONEX - Shipping Container. Sometimes used for housing in RVN
Daisy Cutter - a 15,000 pound BLU-82 bomb dropped by C130 to clear an LZ
Danger Close - an air strike or artillery mission within 100 meters of your location
Dee-Dee - To leave . Also Dee-Dee-Mao!
. Also Dee-Dee-Mao!
Delta Tango - Designated Targets - Pre-selected artillery targets located in daylight for use at night
Det-Cord - Explosive that looks like rope- used to daisy-chain claymores
Dinky-Dao - or Dinky Dau - Crazy (Americanized Vietnamese)
Donut Dolly - Women from the American Red Cross
Dragon Wagon - a tank transporter, also called Low Boy
Dumbo - A C-123 Provider of the USAF
Duster - an M42, an old M24 tank chassis with twin 40mm AA guns in an open turret
Dust off - Medical evacuation helicopter, usually a Huey
E8 - 35mm 16-tube disposable CS gas canister launcher. Had a nasty habit of firing by itself.
E&E - Escape and Evade
Elephant - Radio code for an M48-A3. Also the real thing: 'Nam was crawling with them
Elephant Grass - tall, sharp-edged grass found in the highlands of Vietnam
ELINT - Poor intelligence gathered electronically at great expense
EOD - Explosive Ordnance Disposal
ETS - Estimated Termination of Service - the day you got out of the Army
FAC - Forward Air Controller, usually flying around in an O-1 Birddog .
Fast Mover - FAC radio code for F100, F105, or F4C aircraft .
Fifty - the .50 caliber M2-HB machine gun .
FNG - F***ing New Guy, the term applied to anyone that hadn't been proven in combat yet..
FO - Forward Observer, an artilleryman, usually an officer
Fougasse - 55-gal drum filled with napalm and C4 used as defensive perimeter weapon (also "Phougas")
Frag - Offensive Fragmentation hand grenade: five second fuse
Friendlies - Other US or allied troops on the battlefield
Friendly Fire - Officially called "Misadventure" by the DOD. See Short Round
Fire Mission - radio request to the artillery to drop some HE on the bad guys
Firecracker - M-449 round fired by artillery contains bomblets which go off in mid-air.
Fox Four - FAC terminology for an F-4 Phantom in the ground support role.
FSB - Fire Support Base: usually a battery (3 105mm Howitzers) of guns with a perimeter .
FTA - Fun, Travel, Adventure, from Army recruiting ad. More commonly, F*** The Army)
FUBAR - F____ed Up Beyond All Recognition.
Funny Money - Military Payment Certificates, scrip issued in lieu of dollars .
Funny Paper - Radio code for a topo map .
Goofy Grape - Radio code for purple smoke .
GP - General Purpose bomb. Can kill troops or bust bunkers . Also, GP Small, GP medium, GP large were terms for General Purpose Tents used by the military
. Also, GP Small, GP medium, GP large were terms for General Purpose Tents used by the military
Green Can - 90mm cannon round containing 8,500 darts or "flechettes" .
Grunts - Infantrymen .
Guns - short for gun ships .
Gunship - Usually a UH1B Huey, later a UH1G Huey Cobra.
Gun Target Line - You don't want to be on it. See Short Round
Gun Truck - Cargo truck with added armor and machineguns for convoy escort .
Hawk - Radio code for ambush team .
Hawkeye - Use varied 1) a US sniper or 2) an O-1 aircraft with a starlight scope.
HE - High Explosive.
HEAT - High Explosive Anti-Tank - fin-stabilized armor defeating projectile .
HEP - High Explosive Plastic (Composition B)
HHC - Headquarters and Headquarters Company
H & I - Harassing and Interdicting artillery fire
Hmong - The Montagnards of Laos. Comprised the bulk of the Laotian Royalist Army; fought for the U.S.
Hoi Chanh - an enemy soldier who took advantage of the Chieu Hoi program .
Hook - short for a CH-47 "Chinook" or CH-54 "Sky-Crane" helicopter
Horn - the radio .
Hotel Charlie - Hot Chow .
Hre - Tribe of Montagnards, 110,000 strong.
Huey - Bell UH-1A Helicopter
IFFV - 1st Field Force Vietnam
I Corp - AO of northern South Vietnam
II Corp - The AO for the 1/69 Armor, included Binh Dinh, Kontum, Pleiku provinces
III Corp - South western South Vietnam
Illum - Illumination rounds fired by artillery, mortar, M79, or dropped by aircraft
In Country - on the ground in South Vietnam
Indian Country - Area controlled by Charles
IP - Initial Point - A reference point in the attack
Jarai - Tribe of Montagnards, living in the Pleiku area
Jesus Nut - Large nut which holds the rotor blade on rotor shaft
of a helicopter.
of a helicopter.
Jody - "...Jody was there when you left, you're right" . The guy that stole your girl back home while you were fighting his war for him.
. The guy that stole your girl back home while you were fighting his war for him.
JP-4 - Fuel for Hueys and fast movers
Jungle Boot - Special boots with stainless steel shank and holes to drain water out
Jungle Fatigues - tropical weight jacket and pants
Jungle Penetrator - bullet shaped device used by helicopter crews for extracting down pilots or wounded soldiers in triple-canopy jungle.
Jungle Rot - Any of a number of fungal infections caused by the moisture in Vietnam
KHA - Killed Hostile Action
KIA - Killed In Action
Killer Junior - Killer Senior - technique developed out of the need to protect 155mm battery from ground attacks, since Army didn't design a "Beehive" round for the 155mm howitzer. Killer Juniors were perfected by Lt. Colonel Robert Dean the CO of 1/8th Field Artillery, 25th Infantry Division Artillery. The technique called
for firing HE Projectiles with Time Fuses set at 2 seconds or greater to burst approximately 30 feet off the ground at ranges of 200 to 1,000 meters. Killer Juniors (and the 8" Killer Senior) proved to be more effective than Beehive for antipersonnel because the enemy could not crawl under the burst as they could the fan of the Beehive pattern.
Kit Carson Scout - North Vietnamese Regulars who defected and acted as scouts for US troops
Klick - a kilometer, 1,000 meters
La Dai - Come here!
Laager - Tanks or APCs circled in a defensive position, usually at night
LAW - Light Antitank Weapon - M-72 - Fired 66mm round from disposable launcher
LBE - Load Bearing Equipment, web gear, system for carrying canteen, ammo, pack, battle dressing
(All purpose, Light weight, Individual, Carrying, Equipment or A.L.I.C.E. pack system was the proper term)
(All purpose, Light weight, Individual, Carrying, Equipment or A.L.I.C.E. pack system was the proper term)
LBJ - Long Binh Jail, the Army Stockade in Long Binh
Leaf Killers - nickname for Dumbo pilots spraying Agent Orange defoliant; Operation "Ranch Hand"
Lefty Lemon - Radio Code for Yellow Smoke
Legs - non-airborne infantrymen (see also straight legs)
Lima Delta - Line of Departure: point of no return in an attack
Lima Lima - LL - Land Line: a field phone
Lima Papa - LP - Listening Post
Little People - radio code for ARVNs
LLDB - Vietnamese abbreviation for "Luc Luong Dac Biet", Airborne Special Forces
Loach - Light Observation Helicopter, usually an OH-6 (Hughes 500C) but also OH-58 (Bell Jetranger)
Log - Logistics
Log Bird - resupply helicopter, usually a Huey, sometimes a Chinook
LOH - Light Observation Helicopter (Loach), usually a Hughes 500C but also Bell Jetranger
Louie Lime - Radio Code for Green Smoke
Low Boy - a tank transporter, also called Dragon Wagon
LRRP - Long Range Reconnaissance Patrol - 5 man team dropped into Indian country
LRRP Rations - freeze dried food developed for Long Range Reconnaissance Patrols tasted better than "C" Rations
except for the squid.
except for the squid.
LZ - Landing Zone (note that some were Fire Support Bases and had names)
M-2HB - Caliber 50 machine gun (HB = Heavy Barrel)
M-3A1 - Caliber 45 submachine gun (M-3 was older variant)
M-16A1 - Later, better model of the famous automatic rifle
M-16E1 - Early model M-16, which jammed frequently
M-17 - Protective mask worn by non-vehicle crewmen
M-18A1 - Claymore antipersonnel weapon, threw out 700 steel balls, lethal to 50 meters.
M-24 - Korean War vintage Chaffee light tank (ARVN’s only)
M-26A1 - Fragmentation hand grenade (offensive)
M-291 - 81mm mortar; range 3,500 meters; found in weapons platoon of Infantry Rifle Company
M-30 - 4.2 inch (107mm) mortar (rifled tube), maximum range 5,650 meters; usually a platoon was assigned to a Battalion Headquarters
M-33 - Fragmentation hand grenade (defensive) aka "baseball grenade"
M-41 - Korean War vintage Walker Bulldog light tank (ARVNs only)
M-42 - Duster (twin 40mm BOFORS antiaircraft cannon on M-41 chassis)
M-48A3 - Main Battle Tank used in Vietnam because of its thick hull
M-49 - Trip flare
M-55 - Quad .50 caliber machine-gun mount.. Range 7,275 meters
M-56 - Self-Propelled Anti Tank gun (90mm) on tracked chassis, nicknamed "Scorpion"
52A2 - 5-ton 10 wheel diesel tractor, as in tractor-trailer
M-60 - in Vietnam, the 7.62mm squad machine gun of the infantry; belt fed, air-cooled; 600 rounds per minute
M-67 - 90mm recoilless rifle; range 450-800 meters; an Anti0Tank weapon, it was used to bust bunkers in Vietnam
M-72 - LAW (Light Antitank Weapon) 66mm rocket in disposable fiberglass launcher
M-79 - 40mm grenade launcher, aka "Thumper"; range (HE) 400 meters
M-88 - Tracked recovery vehicle (used by armor and Maintenance units)
M-101 – Split-trail 105mm Howitzer (traditional Artillery units); range 11,000 meters
M-102 – Closed-trail 105mm Howitzer (Airborne and Air Cav units); range 11,500 meters; could be lifted by a Huey.
M-106 - Self-propelled, 4.2 inch (107mm), mortar track (modified M-113)
M-107 - Self-propelled, 175mm gun; tube had range of 32,600 meters; crew of five.
M-108 - Self-propelled 105mm howitzer; tube had range of 11,500 meters;
M-109 - Self-propelled 155mm howitzer; tube had range of 14,600 meters; largest direct-support artillery
M-110 - Self-propelled 8" howitzer; tube range 16,800 meters; five-man crew
M-113 - Armored Personnel Carrier fitted with Chrysler 209HP gasoline engine
M-113A1 - M-113 fitted with General Motors 215HP Detroit Diesel engine
M-114 - Tracked, armored, scout vehicle fitted with Chrysler gasoline engine
M-114A1 - M-114 fitted with General Motors Detroit Diesel engine
M-125A1 - Self-propelled 81mm mortar (based on M-113A1 chassis)
M-132 - "Zippo" track mechanized flamethrower (based on M-113A1 chassis)
M-151 - Jeep (truck, cargo, 4x4)
M-449 - "Firecracker" round fired by artillery containing bomblets, which go off in mid-air.
M-548 - Tracked cargo vehicle
M-577 - Tracked command vehicle, modified M-113 (used by all maneuver Battalions)
M-578 - Tracked recovery vehicle (used by infantry and artillery)
M-728 - Combat Engineer Vehicle (CEV) M-60A1 chassis/turret w/ 165mm demolition gun
Mac the FAC - The Forward Air Controller, usually flying around in an O-1 Bird Dog
MACV - Military Assistance Command Vietnam
Mad Minute - Random firing of all perimeter defensive weapons to discourage infiltration
and test weapons.
and test weapons.
Max Ord - short for Maximum Ordinate
Maximum Ordinate - The highest point in artillery round's trajectory, important for pilot's to know
MEDCAP - Medical Civil Action Program - Our Medics treated Vietnamese villagers
Meo - Laotian term for Hmong tribesmen, meaning "savages".
MFIC - Mother F_____ In Charge
Mighty Mite - Small portable blower used for filling tunnels with CS (tear agent) powder
Mike Mike - Millimeter
Mil - unit of circular and vertical/horizontal measurement in tank gunnery. 6,400 in a circle
MO-GAS - Short for Motor vehicle Gasoline - military grade gasoline
Moi - Literally, "savages". Vietnamese term for Montagnard tribesmen
Montagnard - French Literal: "Mountaineer" Originally from Polynesia; they were the original inhabitants of the coastal region of Vietnam
Montagnard Bar - A Hershey Tropical Bar
MPC - Military Payment Certificates, scrip issued in lieu of dollars
MRRF - Mobile Road Reaction Force
Napalm - Thickened gasoline. Resembles Jell-O in bombs, maple syrup in a Zippo-track
NCOIC - Non-Commissioned Officer In Charge
NDP - Night Defensive Position
Nickel - radio code for a junior NCO. Also five. Usually the platoon sargeant.
No Bic - I don't understand
NLT - No Later Than
Number One - The Best
Number 10 - The worst
Number Ten Thousand – the absolute worst.
Nung - Tribe of Montagnards, 15,000 strong; the fiercest of the Montagnard CIDG troops.
NVA - North Vietnamese Army
OIC - Officer In Charge
One Four - The platoon Sergeant
One Six - The platoon leader
One Six Alpha - The platoon leader's gunner, the Assistant tank commander
OOA - On or About
Oscar Papa - Observation Post
Oscar Track - Call sign for Company HQs or Battalion S-3
P-38 - Can opener that came with C-Rations
Penny - Radio code for an enlisted man
PFT - Portable Flame Thrower
Phougas - 55-gal drum filled with napalm and C4 used as defensive perimeter weapon (also "Fougasse")
Piaster - Vietnamese Money (in fall 1968 100 piasters was 1 US Dollar)
POL - Petroleum, Oil and Lubricants
Poncho Liner - lightweight, camouflage blanket for use at night. Very useful
Pop Smoke - to ignite a smoke grenade for identification and wind direction for Hueys
PRC-25 - AN/PRC-25 man portable FM radio set (prick-25)
PRC-77 - AN/PRC-77 man portable secure FM radio set (prick-77)
Prick 25 - Slang for the AN/PRC-25 man portable FM radio set
Punji Stake - sharpened bamboo stick booby trap smeared with excrement to cause infection
Push - radio frequency (because you Pushed a button to select one)
Quad-Fifty – Four, Caliber 50 machine guns (M2HB) mounted on a gun truck for convoy defense
Quarter Cav-50 - Nickname for 1/4th Cavalry
Quick Reaction Force - Helicopter-borne infantry with gun ships able to react to enemy attacks
Q-Service - Quarterly service of vehicles
Range Card – Artillery never used them, but said they did .
Red Ball - Radio code for a hard surface road, Also nickname for resupply convoy
Red Haze - Radio code for ammonia sensing people-sniffer in aircraft
Red Legs - Artillerymen, aka "Cannon-Cockers"
Red Splash - another name for mad-minute
Renago - Tribe of Montagnards, 10,000 strong.
Rootin’-Tootin’-Raspberry - Radio Code for Red Smoke
REMF - Rear Echelon Mother F***er
Remington Raider - term for REMF (above); anyone typewriter-armed; see also "Smith-Corona Commando"
Rhade - Tribe of Montagnards, 120,000 strong; of Malay-Polynesian descent, continued to build houses on stilts.
RIF – Reconnaissance in Force.
RF/PF or Ruff Puffs - Regional Forces/Popular Forces, usually without weapons (see ARVN)
Rock N' Roll - an M-16 on full automatic
Rome Plow - A Caterpillar D7E bulldozer used for defoliation missions. The blade, called a plow, was manufactured in Rome Georgia.
Round Eye - Caucasian, usually a female
RPD - (Ruchnoi Pulyemet Degtyarova) Soviet made squad machinegun, 7.62mm
RPG2 - Rocket Propelled Grenade Launcher, Soviet made
RPG7 - Later model Rocket Propelled Grenade Launcher, Soviet made
RRF - Rapid Reaction Force
RTO - Radio Telephone Operator
Rucksack - also “Ruck”: packs carried by grunts
Ruff Puffs - Regional Forces/Popular Forces, usually without weapons (see ARVN)
SA - Small Arms
Sabot - Dutch word for "wooden shoe" cladding around an APDS round
Sandy - A1-E1 Skyraider providing fire suppression on a SAR mission
SAR - Search And Rescue mission - looking for downed pilots
Sappers - NVA/VC whose job it was to blow things up; also an engineer
Search and Avoid - Typical ARVN mission.
Search and Destroy – Typical American mission
Sedang - Tribe of Montagnards, 70,000 strong.
Short - Very little time left in country
Short Round - Artillery round that falls short of the target on the Gun Target Line
Sinh Loi - Sorry about that!
SITREP - Situation Report, made hourly to next higher headquarters
Six - Radio call sign of a unit commander (Company, Battalion)
Six One Higher - Radio code for your boss if you're a Six
SKS - Soviet/Chicom 7.62mm carbine
Sky Pilot - Chaplain
Sky Soldier - paratrooper
Slick - a UH1D used for carrying troops, as opposed to a gunship it had slick sides no guns
Sling Load - load carried beneath a helicopter on a cable
Smith-Corona Commando - Term for a REMF; anyone typewriter-armed; see also Remington Raider
SNAKE - slang for AH-1 Huey Cobra attack helicopter
SOI - Signal Operating Instructions: codes for radio communications
SPAD - A1-E1 Skyraider providing tactical air support
SP - Start Point. Beginning of a road march
Spectre - Radio code for the AC-130 Gunship. (confused with "Spooky" and "Puff" by all)
Spooky - Radio code for the AC-47 Gunship the REMF’s and Saigon reporters called "Puff"
(the magic dragon)
(the magic dragon)
SP Pak - Sundry Pak Platoon. Contained cartons of cigarettes, soap, toilet paper, etc..
SRAP - Short Range Ambush Platoon
Starlight Scope - AN/PVS-2 Image Intensification Device, turned night into day
Strongpoint - term for any defended position, especially along highways to discourage ambushes.
Super-quick - 105mm howitzer HE round fuse for immediate detonation
Swift Boat - 50' boats operated by USN out of Qui Nhon et al; armed with 50 caliber machine guns
TA-312 - Hand-cranked field phone
TAC-E - Tactical Emergency
TAOR - Tactical Area Of Responsibility
Tango Charlie - Radio code for Tank Commander (also Track Commander)
Tea Party - radio code for an ambush
Tee-Tee - very little
Three Quarter Cav - nickname of 3rd Squadron 4th Cavalry because abbreviation is 3/4 Cav
Thumper - an M-79 grenade launcher, so called because it made a hollow "thump" when fired
Tien Bing - Chinese for "Sky Soldier"
Tien Lien - Vietnamese phrase for "forward" or "charge"
TOC - Tactical Operations Center: a huge bunker where the old man lives with his staff
TOE - (also TO&E) Table of Oranganization and Equipment; Army rules for personnel & equipment
TOT - Time On Target - Artillery fire from different batteries timed to explode at the same time.
Tracks - the collection of track blocks on a tracked vehicle (REMF’s say treads)
Also slang for M113A1 Armored Personnel Carriers
Also slang for M113A1 Armored Personnel Carriers
TROPO - short for tropospheric antennas used for long-range voice communication
UCMJ - Uniform Code of Military Justice
UFN - Until Further Notice
UH-1A - sometimes appeared as HU-1A, which led to name "Huey", the symbol of the Vietnam War.
Uncle Ho - Ho Chi Minh
USARPAC - United States Army Pacific
USARV - United States Army Vietnam
URC-10 - AN/URC-10 Survival Radio used by LRRPs
UTM - Universal Transverse Mercator - grid system on topo maps
Viet Cong - Literally, Vietnamese Communist: The Former Viet Minh were co-opted by communist sympathizers
Viet Minh - Literally, Vietnamese Nationalist: movement started by Ho Chi Minh to get French out of Indochina
Voting Machines - Nickname for ARVN tanks because they only came out during a “coup d'etat”
VTR - Vehicle, Tracked, Recovery (the tow track for tanks), Usually an M-88
Web Gear - canvas belt and shoulder straps used for packing equipment and ammunition on infantry operations
Whispering Death - Charles' name for a B-52 strike. He couldn't hear or see them
WHA - Wounded Hostile Action
WIA - Wounded In Action
Willie Peter - White Phosphorous round or grenade (evil stuff)
XM-177E2 - CAR-15, short-barrel, collapsible-stock version of M-16 rifle
XM-203 - 40mm grenade launcher attachment for M-16 rifle
XO - Executive Officer; the second in command of a unit.
Yankee Station - Tonkin Gulf Area of South China Sea patrolled by US Navy
Yards - Affectionate GI term for Montagnards
Zippo Track - An M-113 APC converted to a mechanized flame-thrower M132A2
Zulu Time - The world is divided into 24 time zones. For easy reference in communications, a letter of the alphabet has been assigned to each time zone (no letter I or O as they can be confused with numbers). The "clock" at Greenwich, England is used as the standard clock for international reference of time in communications, military, maritime and other activities that cross time zones. The letter designator for this clock is Z.
Times are usually written in military time or 24 hour format such as 1830Z (6:30 pm). To pronounce this, the phonetic alphabet is used for the letter Z, or Zulu. This time is sometimes referred to as Zulu Time because of its assigned letter. It's official name is Coordinated Universal Time or (UTC). Previously it had been known as Greenwich Mean Time or GMT but this has been replaced with UTC.
Zulu +seven hours is the time in 'Nam