The fundamental role of an Air Service Group during WWII was to provide high-level maintenance and repair of US Army Air Forces aircraft.  One ASG was typically assigned to a Group of operational aircraft. The ASGs were intended to operate at dispersed airfields performing repairs or maintenance more complex than that performed by the ground crews assigned to each Group.  The ASGs were also capable of recovering damaged aircraft in the field and they frequently supported air base operations.

From its inception in February 1942 until December 1943, the 330th ASG served as a “Parent Training Group,” training other ASGs before they deployed overseas. During this time, they were stationed in Pendleton, OR.

In December 1943 the unit changed from a training to an operational role. They moved to the Midwest (Oklahoma City, OK and Salina, KS) where they spent six months working on B-29 aircraft (including participating in the “Battle of Kansas”) and preparing for overseas deployment.

The officers and men of the 330th ASG left the US in July 1944 and arrived at Saipan in mid-August. There, assigned to the 73rd Bomb Wing, they helped build Isely Field – the first B-29 airbase in the Marianas Islands – and then supported the strategic bombing of Japan by keeping the B-29s based at Isely Field operational until the end of the war in the Pacific.