| Conflict: | Operation Hong Kil Dong |
| Partof: | Vietnam War |
| Date: | July 9 – August 26, 1967 |
| Place: | Near Tuy Hòa, Phú Yên Province, South Vietnam |
| Result: | South Korean victory |
| Combatant2: | North Vietnam Viet Cong |
| Commander1: | Lt. Gen.Chae Myung Shin |
| Commander2: | Unknown |
| Units1: | Capital Division 9th Infantry Division |
| Units2: | 5th Division 85th Regiment 95th Regiment |
| Casualties1: | 26 killed |
| Casualties2: | Korean body count: 638 killed 88 captured[1] 359 individual and 98 crew-served weapons recovered |
Operation Hong Kil Dong (홍길동작전) was the largest South Korean operation of the Vietnam War.[2] The 48-day-long operation was claimed by South Korea as a major success as they claimed to have thwarted People's Army of Vietnam (PAVN)/Viet Cong (VC) infiltration into friendly areas. The results of the operation were a claim of a kill ratio of 24:1 in the Korean's report primarily killed by heavy artillery, aerial bombardment and B-52 Arclight strikes : 638 PAVN/VC. 98 crew-served and 359 individual weapons were found in the aftermath.[3]
Vietnam veterans such as Commander of the ROK Army Forces in Vietnam and the Chief of Staff of the ROK Army, General Chae Myung-shin, and Colonel (Retired) Choi Hee Nam, wrote about Operation Hong Kil Dong in their Vietnam War memoirs.[4] [5]