U. S. Marine Gunnery Sergeant Markus Caldwell, Instructor, Motor Transportation Maintenance Instructional Company, Logistics Operations School, Marine Corps Combat Service Support Schools, addresses guests during his retirement ceremony on Camp Johnson N.C., March 28, 2013. Friends, family, and service members gathered to celebrate Gunnery Sergeant Caldwell for his 22 years of faithful service to the United States Marine Corps. (U.S. Marine Corps photo by Sergeant Mark E. Morrow Jr/Released)