1967 in the Vietnam War January . Operation Deckhouse Five was conducted by the United States Marine Corps and South Vietnamese Marine Corps forces along the Mekong River Delta , as part of the Vietnam War . The operation was notable in that it was a sizable , combined U . S . Marine and Vietnamese Marine amphibious operation and it was the last Special Landing Force ( SLF ) amphibious landing to take place beyond the boundaries of I Corps . The operation occurred January 6 – 15 , 1967 . Operation " Cedar Falls " was a military operation conducted primarily by US forces . The aim of this massive search and destroy operation was to eradicate the so - called " Iron Triangle " , an area located in close proximity to Saigon which had become a major stronghold of the communist National Liberation Front ( NLF ) or Viet Cong . The operation began on January 8 , 1967 and ended on January 28 , 1967 . February . The Battle of Tra Binh Dong was probably the most famous battle fought by the South Korean Marines . It was fought in the Tra Binh Dong village near the border of Cambodia . Operation Bribie , or the Battle of Ap My An , was fought during the Vietnam War in Phuoc Tuy province between Australian forces from the 6th Battalion , Royal Australian Regiment ( 6RAR ) and the Viet Cong , reinforced by North Vietnam ese regulars . Operation Junction City was an 82 - day military operation conducted by United States and Republic of Vietnam ( RVN or South Vietnam ) forces begun on 22 February 1967 lasting till May 14 , 1967 . It was the largest U . S . airborne operation since Operation Market Garden during World War II , the only major airborne operation of the Vietnam War , and one of the largest U . S . operations of the Southeast Asia n conflict . Operation Union was a military operation conducted by the United States Marine Corps . It was a search and destroy mission in the Que Son Valley carried out by the 1st Marine Regiment . The object of the operation was the 2nd Division of the People ’ s Army of Vietnam ( PAVN , often in US sources " North Vietnamese Army " or NVA ) . Launched on April 21 , 1967 the operation ended May 16 . April . From April - May 1967 the Battle of Hill 881 was a battle between the People ' s Army of Vietnam ( PAVN or NVA ) and United States Marines . Conducted in the I Corps Tactical Zone it became known as " the Hill Fights " , involving Hill 881 North , Hill 881 South , and Hill 861 . May . Running from 11 May – July 1 , 1967 Operation Malheur I and Operation Malheur II were a series of military actions conducted by the United States army subduing increased activity by National Liberation Front ( NLF ) forces in the northern part of South Vietnam . Operation Union II was a search and destroy mission in the Que Son Valley carried out by the 5th Marine Regiment . Launched on May 25 , 1967 the operation ended June 5 . July . Running from July 2 to July 14 , 1967 Operation Buffalo was a major operation that took place in the southern half of the DMZ , northeast of Con Thien . The Battle of July Two was a short engagement that took place along Route 561 between Gia Binh and An Kha , during Operation Buffalo . The North Vietnamese 90th Regiment was engaged with the American Marines . Operation Hong Kil Dong was the largest South Korean operation of the Vietnam War to halt infiltration into friendly areas . The " Royal Thai Army Regiment " starts its deployment in South Vietnam . Operation Swift was a search and destroy mission in the Que Son Valley carried out by the 1st Marine Division . Launched on September 4 , 1967 the ensuing battles killed 114 Americans and an estimated 376 North Vietnamese . The operation ended September 15 . October . Operation Medina was a search and destroy operation conducted in the Hai Lang Forest Reserve of South Vietnam . It lasted till the 20th of October . The Battle of Ong Thanh was a battle of the Vietnam War that saw the soldiers of the 2nd Battalion , 28th Infantry ( the " Black Lions " ) , ambush ed and subsequently decimated by a well - entrenched and prepared National Front for the Liberation of South Vietnam ( NLF ) , or Viet Cong , regiment outnumbering the Americans almost 10 - to - 1 . The first battle of Loc Ninh was a conflict in the Vietnam War fought by the Vietcong and the CIDG , and ended when ARVN and US forces came to the camp . The Battle of Đắk Tô was a series of major engagements of the Vietnam War that took place in Kontum Province , in the Central Highlands of the Republic of Vietnam ( South Vietnam ) . November . Operation Wheeler / Wallowa was an offensive on the part of the Americans , of which the My Lai Massacre by a platoon led by Lt William Calley was part . December . The Battle of Tam Quan was a two - week battle fought when the American 8th Cavalry and other units disrupted the 7th and 8th battalions of the 22nd NVA Regiment , which was in the process of preparing to conduct a major attack on ARVN installations at Tam Quan .