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CAMP PENDLETON, Calif. (AP) -- Marines will gather for a memorial service at Camp Pendleton for two men killed last month when their Marine helicopter collided with a Coast Guard plane.

Thursday's service at the base chapel is for Maj. Samuel Leigh of Belgrade, Maine, and 1st Lt. Thomas Claiborne of Parker, Colo. They died on a training exercise Oct. 29 about 50 miles off the Southern California coast. Their AH-1W Super Cobra helicopter collided with a Coast Guard C-130 plane on a mission to rescue a missing boater.

Seven Coast Guard members who also died in the crash have been honored at a service in Sacramento.

A joint Marines-Coast Guard board is investigating the cause of the crash.

(Copyright 2009 by The Associated Press. All Rights Reserved.)