Marine Corps Air Station Ewa (MCAS Ewa) was a United States Marine Corps air station that was located 7 miles (11 km) west of Pearl Harbor on the island of Oahu, Hawaii. The base was hit during the attack on Pearl Harbor, and later served as the hub for all Marine aviation units heading into combat in the Pacific Theater during World War II. The base was closed in 1952 because its runways were too short for jet aircraft, and expansion was impossible due to the proximity of Naval Air Station Barbers Point.