Marine Air Group 21
Marine Air Group 21 was at Ewa Marine Air Corps Station. Three squadrons were based there, VMF-211, VMSB-232 and VMJ-252, although VMF-211 was physically at Wake Island with its F4F Wildcats, delivered by Enterprise. Thirty-three of the aircraft at Ewa were destroyed or damaged in the attack by the Japanese.
You can find out more about Wildcat pilots in the following Osprey book: