Cpl Elmer C Greenbank was a Munitions Worker in the 392nd Bombardment Squadron (in the 30th Bombardment Group).

The 392nd Bombardment Squadron was assembled at March Field, CA in the summer of 1943. The squadron moved to Barking Sands, Kauai, Hawaii Territory in Oct 1943. In Nov 1943 the squadron moved to Canton Island in the Phoenix Islands, and began combat operations against the Japanese.

Over the next year and a half the squadron kept moving to "one damn island after another". In Jan 1944 the 392nd Bomb Squadron moved to Apamama Island, followed by a move to Kwajalein Island in Mar 1944. Their final move was to Saipan in Aug 1944. They remained there until Feb 1945, at which time they returned to Hawaii. They were sent back to the US in the summer and fall of 1945.

https://30thbombgroup.org/wp-content/uploads/2023/09/392.unit_.history.v02.pdf