Greenville AAB was the 334th Bombardment Group, being assigned on 16 July 1942. Its flying squadrons were the 470th, 471st, 472nd, and 473rd Bombardment squadrons, flying B-25 Mitchell medium bombers. The 334th's mission was to provide flying training to personnel and bomber crews. The 334th was inactivated on 1 May 1944 with personnel and equipment being reassigned to the 330th Army Air Forces Base Unit (Replacement Training Unit/Medium Bombardment). On 1 January 1945, the 330th was redesignated as the 128th Army Air Force Base Unit in conjunction with the base's reassignment to the First Air Force. The 56th Combat Training Wing became the overall commanding unit at Greenville AAB on 1 May 1945, being reassigned from Morris Field, North Carolina which was closed. Its mission was to perform training and processing of bombardment replacement crews for overseas duty and the training of permanent party instructor personnel with the view of qualifying all personnel assigned for overseas duty. 90th Bombardment Group The first combat unit assigned to Greenville for training was the 90th Bomb Group (Heavy), which was assigned on 21 June 1942 and flew Consolidated B-24 Liberator heavy bombers. The unit consisted of four squadrons: 319th, 320th, 321st, and 400th Bombardment Squadrons. With its training completed, the group transferred to Ypsilanti, Michigan on 18 August 1942 for follow-on training near Ford's Willow Run aircraft manufacturing plant. After another transfer (to Hickam Field in Hawaii), in early November 1942, the 90th BG transferred to the Pacific theater, being stationed at Townsville, Queensland, Australia with the Fifth Air Force. 310th Bombardment Group The 310th Bomb Group (Medium) trained at Greenville Army Air Base between 18 September and 17 October 1942, flying North American B-25 Mitchell medium bombers. The unit consisted of four squadrons: 379th, 380th, 381st, and 428th Bombardment Squadrons. With its training completed, the group went overseas, transferring to Médiouna Airfield, in French Morocco with the Twelfth Air Force. With the departure of the 310th, the 334th began training personnel for assignment as replacements, rather than complete bomb groups. After training was completed, the personnel would be assigned overseas to existing units in the wartime theaters. Photographs Photographs of the WWII base and soldiers can be viewed in the Greenville County Library System digital collections. Postwar era In the summer of 1945, with the war coming to an end, a number of training bases were slated for closure. This included Greenville