U.S. Marine Corps officials on Tuesday identified the four Marines killed in a helicopter crash Monday in a training area on Okinawa island.

Killed were Maj. Richard J. Eisloeffel, 34, of El Cajon, Calif.; Capt. Michael F. King, 31, of Bend, Ore.; Cpl. Sean M. Timmons, 20, Isle of Palms, S.C.; and Cpl. Charles F. Dehn II, 20, of Glendale, Ore.The accident occured when two CH-46 helicopters apparently collided while conducting routine training operations, a United States Forces official said Tuesday.

One of the helicopters crashed in mountainous terrain near the Marine Corps base camp in Futenma, Okinawa, about 970 miles south of Tokyo. The other returned to the air station with a missing nose strut.

There were no casualties in the second helicopter. Both helicopters were assigned to Marine Medium Helicopter Squadron-262 based at Marine Corps Air Station, Futenma.