When the Korean War began in 1950, VMF-323 began combat operations from as part of Marine Aircraft Group 33 (MAG-33), supporting ground forces in the Battle of Pusan Perimeter, Battle of Inchon, Battle of Chosin Reservoir and almost every other major campaign of the conflict. During action near Kosong, on 11 August 1950, a VMF-323 Corsair pilot, Captain Vivian M. Moses, became the first Marine aviator killed in Korea. The unit also took part in the attack on the Sui-ho Dam in June 1952.