made seven raids into North Korea from the , one of which was conducted 12—16 August 1950, in which a combined force of sixteen Marines and twenty-five Navy Underwater Demolition Teams raided the Posung-Myon area destroying three tunnels and two railway bridges without losing one man. Deactivated in June 1953 and reactivated in 1958 Interim Years Cuban Missile Crisis 1st Reconnaissance Battalion (Forward) deployed to Guantanamo Bay Naval Base, Cuba and Haiti in October–November 1962 to await the invasion of Cuba. Upon the resolution of the Cuban Missile Crisis, the battalion returned to MCB Camp Pendleton. Vietnam War Operation Kansas, June 1966 By June 1966, the 1st Marine Division had plans to expand its assigned Tactical Area of Responsibility (TAOR) southward from Da Nang to Tam Kỳ, the capital of the Quảng Tín Province. Pressure from the Military Assistance Command, Vietnam (MACV) had placed Brigadier General William A. Stiles, the assistant division commander (ADC), position to respond by conceiving an operation by ordering an extensive reconnaissance effort between Da Nang and Tam Ky. BGen. Stiles had divided the operation into two phases. The first phase was to send in his recon assets in an area in the vicinity of the Hiệp Đức District. The division's intelligence (D-2) section had sources of a headquarters of the People's Army of Vietnam (PAVN) 2nd Division lying somewhere near the western border of I Corps in the Quế Sơn Valley. The second phase consisted of a massive exploitation of the recon team's findings, by sending in a joint show-of-force; four infantry battalions from the 1st Marine Division and the ARVN 2nd Division. On the afternoon of June 13, a thirteen-man recon team, accompanied by the command group, of 1st Recon Battalion landed by helicopters in the middle of the Quế Sơn Valley onto the small mountain of Nui Loc Son. In the course of the next 24-hours, six more recon teams were deployed in different strategic positioning sites, ringing the valley. This enabled the teams to actively report on enemy activity, and if possible, forward observe for either air strikes or artillery fire. Up to eight battalions were on full standby— four battalions of Marines and ARVN each, ready to deploy against any hostile forces encountered. One recon team worked their way south of Hiệp Đức after they set up positions along the heavily wooded Hill 555. They spotted several groups of PAVN of