 At the beginning of the Korean War, the initial deployment of Marines was a provisional brigade activated on July 7, 1950 — the 1st Provisional Marine Brigade — formed from the 1st Marine Division and the 1st Marine Aircraft Wing.Its core consisted of two units — a regimental combat team from the 5th Marine Regiment and Marine Aircraft Group 33 (MAG-33).Their job was to provide close air support, resupply, and Medevac for Marine ground forces.