1st Lt. Thomas Claiborne, 26, of Parker, was on the Marine helicopter along with Maj. Samuel Leigh, 35, of Kennebec, Maine.

Claiborne was an honor student at Chapparal High School. He graduated in 2002. While in the military, he received the National Defense Service medal and the Global War on Terrorism Service medal.

Claiborne's family has declined to speak publicly at this time.

All seven aboard the Coast Guard plane are stationed at the Coast Guard Air Station in Sacramento, Calif., where their aircraft was based.

Connie Seidman of Carmichael, Calif., whose 43-year-old son was aboard the plane, said he had been in the Coast Guard since he was 20 and loved to fly. Chief Petty Officer John Seidman of Stockton, Calif., last visited his family in February after returning from a posting in Hawaii, and they talked on the phone often.

Seidman said Saturday she was thinking about "all the things that we wanted to tell him that we can't."

"He was flying, just like he liked to," she said.

The aircraft commander, Lt. Cmdr. Che Barnes, 35, is from Capay, Calif. His co-pilot, Lt. Adam Bryant, 28, is from Crewe, Va.

Thursday's collision occurred as the Coast Guard airplane was itself carrying out a search for a missing boatman.

Six Coast Guard cutters, three Navy ships and multiple helicopters searched the ocean off Southern California. Rescuers had found several pieces of debris from both aircraft but there was no sign of the victims. No bodies have been found in the debris field, and the mission is still considered search and rescue, not search and recovery, Coast Guard Petty Officer 2nd Class Jetta Disco said Saturday morning.

Officials were collecting evidence and reviewing recordings of transmissions by the aircraft to try to determine how the collision occurred.

The accident happened at 7:10 p.m. Thursday in airspace uncontrolled by the FAA and inside a so-called military warning area, which is at times open to civilian aircraft and at times closed for military use, Federal Aviation Administration spokesman Ian Gregor said. He did not know the status of the airspace at the time.

Capt. Tom Farris, commander of the Coast Guard's San Diego sector, said it's not unusual to have a high volume of military traffic working in training areas and pilots in the area are responsible for seeing other aircraft around them under a so-called "see-and-avoid principle."

Minutes before the collision, the FAA told the C-130 pilot to begin communicating with military controllers at Naval Air Station North Island in San Diego Bay, but it was not known if the pilot did so, Gregor said.

The search covered 644 square miles of ocean but rescuers were concentrating on a debris field 50 miles off the San Diego coast.

The Sacramento-based C-130 crew was looking for 50-year-old David Jines, who was reported missing after leaving Avalon Harbor on Santa Catalina Island man in a 12-foot motorized skiff to reach a friend in high winds Tuesday, authorities said.

The four-engine plane was conducting its search from an altitude of 900 to 1,000 feet and visibility was 15 miles.

Jines' friend, Linda Jones, told The Associated Press that Jines boarded her disabled yacht and helped her maneuver to an area where they thought they had made anchor. After helping her, he set off to return to his sailboat, which was anchored at the Avalon harbor.

She reported Jines missing the next day when she returned to the harbor and couldn't find him.

"I didn't know Dave was in any kind of peril," she said.