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Marine Observation Squadron One (VMO-I) was activated on 27 October 1943 as VMO-155 at Quantico, Virginia, with OY-I light observation planes. The squadron deployed to the South Pacific in January 1944 and was redesignated VMO-I on 12 February 1944.
In july 1944, VMO-I launched from escort carriers into Guam and flew 213 spotting missions in support of the liberation of the island from the Japanese. During February and March 1945, the squadron supported the seizure of Iwo Jima.
In july 1952, the squadron received HO5S helicopters...