U.S. Marines from 5th Battalion, 11th Marine Regiment, 1st Division, Camp Pendleton, California huddle in a sand storm created by the lifting of a CH-46 (not shown) during a tactics evolution live fire exercise in southern Arizona in support of Weapons Tactics Instructors course 2-08 (WTI 2-08) on March 29, 2008. WTI 2-08 is under the instruction of Marine Aviation Weapons and Tactics squadron-1 on Marine Corps Air Station in Yuma, Ariz.