Marines and Sailors assigned to Company A, 3rd Assault Amphibian Battalion, 1st Marine Division, celebrate the Marine Corps’ 240th birthday aboard Yuma Proving Grounds, Ariz., Nov. 10, 2015. The Marines and Sailors celebrated the birthday as a culminating event to the 18-day field operation. - Marines and Sailors assigned to Company A, 3rd Assault Amphibian Battalion, 1st Marine Division, celebrate the Marine Corps’ 240th birthday aboard Yuma Proving Grounds, Ariz., Nov. 10, 2015. The Marines and Sailors celebrated the birthday as a culminating event to the 18-day field operation.