Copter collision kills 7 Marines in US desert

Two Marine Corps helicopters collided in midair over a remote section of the California desert during a nighttime exercise, killing seven Marines in one of the deadliest military training accidents in years.The latest in a series of crashes involving troops from Camp Pendleton occurred about 8 p.m. Wednesday near the Chocolate Mountains along the Arizona border and involved an AH-1W Cobra carrying two crew members and a UH-1 Huey utility helicopter carrying the other five, Lt. Maureen Dooley with Miramar Air Base in San Diego said Thursday.Six of the victims were from Camp Pendleton the largest base on the West Coast and one was from Marine Corps Air Station Yuma in Arizona. Their identities will not be released until their families have all been notified.Officials were investigating the cause of the accident, gathering most of the evidence Thursday after the sun rose in the area favored by the U.S. military and its allies for training because the hot, dusty conditions and craggy mountains replicate Afghanistans harsh environment and the clear weather allows for constant flying.Cpl. Steven Posy with Marine Corps Air Station Miramar said the weather was mild on Wednesday night. The crash occurred in a remote portion of the Yuma Training Range Complex.The AH-1W carries a crew of two a pilot and gunner and is considered the Marine Corps main attack helicopter. The UH-1Y, which is replacing the aging version of the Huey utility helicopter first used during the Vietnam War, carries a crew of one or two pilots, a crew chief and other crew members, depending on the mission.