A Marine crew chief with Marine Medium Tiltrotor Squadron

A Marine crew chief with Marine Medium Tiltrotor Squadron 163 (Reinforced), 11th Marine Expeditionary Unit, provides security with an M240G medium machine gun on an UH-1Y Super Huey in support of a visit board search and seizure exercise conducted during Certification Exercise (CERTEX) off the coast of Southern California, June 16, 2014. CERTEX serves as the final at-sea period for the 11th MEU and Amphibious Squadron 5. It is designed to strengthen the blue-green team's ability to operate together and to respond to various situations while deployed. (U.S. Marine Corps photo by Gunnery Sgt. Rome M. Lazarus/Released)