Ras Siyyan, Dijibouti ? Ten U.S. service members died when a pair of Marine Corps helicopters from a unit based in North Carolina crashed off the coast of Africa, U.S. military officials confirmed Sunday.

The two CH-53E choppers, carrying a dozen crew and troops from a U.S. counterterrorism force, went down during a training flight Friday in the Gulf of Aden, near the northern coastal town of Ras Siyyan in Djibouti.

Two crew members who were rescued were taken in stable condition to the U.S. military’s Landstuhl Regional Medical Center in Germany.

The aircraft and eight Marines were from Marine Heavy Helicopter Squadron 464, based at Marine Corps Air Station New River. Two Air Force airmen killed were from bases in Washington state and Virginia.