MAG-25, comprising Headquarters Squadron 25 and transport squadron VMJ-253, initially operating from New Caledonia, began flying missions in support of the Battle of Guadalcanal in September 1942. It was soon joined by the 13th Troop Carrier Squadron, United States Army Air Forces, an uncommon inter-service cooperative effort. In late November 1942, at the direction of VAdm. Aubrey Fitch, MAG-25 formed the nucleus of SCAT, with its senior officer serving as SCAT's commanding officer throughout the organization's existence. MAG-25 soon grew to include VMJ-152 and SMS-25 of the Marine Corps, and the 801st Medical Air Evacuation Transport Squadron, USAAF. In March 1943 it was joined by VMJ-153. From January to July 1944, Marine Air Repair & Salvage Squadron 1 was attached to the group. SCAT provided rapid transport of personnel and cargo, including munitions, food, replacement parts, and medical supplies, to and from forward areas. On rearward flights SCAT frequently provided aeromedical evacuation of wounded or sick personnel. Aircraft typically included a flight nurse, corpsman, or flight surgeon as part of the crew, split between USAAF personnel of the 801st MAETS and the Navy medical personnel of Headquarters Squadron-25. SOPAC Combat Air Transport Command was dissolved and reconstituted as Solomons Combat Air Transport Command after its Army Air Forces troop carrier units departed in July 1944, with MAG-25 continuing to utilize the "SCAT" acronym. At that time VMR-253 departed MAG-25 to join the Transport Air Group in the Central Pacific. SCAT was finally dissolved in February 1945 as MAG-25’s primary mission shifted to support of 1st Marine Aircraft Wing operations in the Philippines. MAG-25, including the attached 13th Troop Carrier Squadron, was awarded the Distinguished Unit Citation as part of the 1st Marine Division for the Guadalcanal campaign. SCAT received a Navy Unit Commendation for its operations in the South Pacific from December 1942 to July 1944. In October 1945, MAG-25 began moving to Tsingtao, China, where VMR-153 participated in the evacuation of liberated prisoners from the Weixian Internment Camp. MAG-25 returned to the United States in June 1946 and was deactivated in 1947. MAG-25 was reactivated in February 1950 at Marine Corps Air Station El Toro, with VMR-152, and VMR-352 attached, equipped with Douglas R5D aircraft. During the Korean War the group's forward echelon supported the operations of the 1st Marine Division and 1st Marine Aircraft Wing, flying mostly personnel and cargo transport missions while based at Itami, Japan. VMR-253, flying the Curtiss R5C and Fairchild R4Q, was reattached to the group in 1951. After the Korean Armistice Agreement, VMR-253 deployed to Itami to assist in post-armistice airlift operations. The nickname "Flying Boxcars" was widely used for the Douglas R4D aircraft flown by MAG-25 during World War II, predating its attachment to the post-war Fairchild R4Q aircraft.
