Crew of the C-130 and UH-1 crash.

The two Marine pilots were conducting routine training about 15 miles off San Clemente Island when their helicopter collided with the U.S. Coast Guard plane.

Marine Corps Air Station Miramar identified them as Maj. Samuel Leigh and 1st Lt. Thomas Claiborne, both with Marine Light Attack Helicopter Squadron 469.

The Coast Guard's seven missing personnel were stationed at Coast Guard Air Station Sacramento, California, where their aircraft was based.

Castillo has said that an investigation was beginning with the Marine Corps. A large debris field has been located, and pieces have been collected, the Coast Guard spokesman said.

The Coast Guard identified its seven missing personnel as
Lt. Cmdr. Che J. Barnes of Capay, California, aircraft commander;
Lt. Adam W. Bryant of Crewe, Virginia, co-pilot;
Chief Petty Officer John F. Seidman of Stockton, California, flight engineer; Petty Officer 2nd Class Carl P. Grigonis of Mayfield Heights, Ohio, navigator; Petty Officer 2nd Class Monica L. Beacham of Decaturville, Tennessee, radio operator;
Petty Officer 2nd Class Jason S. Moletzsky of Norristown, Pennsylvania, air crew; and
Petty Officer 3rd Class Danny R. Kreder II of Elm Mott, Texas, drop master.