| K |
| K | Thousand (From "Kilo") |
| K/D | Killed and Detained |
| K/W | Killed and Wounded |
| KA | Khmer Army |
| KAF | Khmer Air Force |
| Karst | Limestone outcropping or ridge. |
| KATUSA | Korean Army Troops with the US Army |
| KBA | Killed by Air |
| KBA | Killed by Artillery |
| KC | Khmer Communist |
| KCAG | Korean Civic Action Group |
| KCI | Khmer Communist Infrastructure |
| KCS | Kit Carson Scout |
| KEYSTONE | Redeployment Code Name |
| KG | Kompong (Cambodian for Province) |
| Khom | Urban Subdivision |
| KIA | Killed in Action |
| KIAS | Knots Indicated Air Speed |
| KIT | Key Interteam |
| KKK | Khmer Kampuchea Krom - Cambodian Government-sponsored politico-military organization. |
| KLF | Khmer Liberation Front |
| KLSC | Korean Logistic/Logistical Service Corps |
| km/KM | Kilometer(s) |
| KMAG | Korean Military Advisory Group (US) |
| KMT | Koumintang |
| KR | Khmer Republic (Cambodia); |
| KR | Khmer Rouge (Insurgent Group) |
| KS | Khmer Serei |
| KSB | Boston Whaler |
| KSCB | Khe Sanh Combat Base |
| kt/KT | Knot (nautical miles/hour) |
| KTAS | Knots True Air Seed |
| kw/KW | Kilowatt |