sentences:  Marine Observation Squadron 1 (VMO-1) was commissioned on July 1, 1937 at Marine Corps Base Quantico.They were redesignated Marine Observation Squadron 151 (VMO-151) on July 1, 1941.The squadron left for San Diego, California in December 1941 with the rest of the 1st Marine Aircraft Wing, but returned to MCB Quantico in January 1942.