Senior Airman Robert Gresham hooks up hoses to the main landing gear strut on a C-17 Globemaster III at the Home Station Check hangar at Joint Base Charleston, S.C., Feb. 21, 2012. The struts are flushed and filled with clean hydraulic fluid to provide better suspension for the aircraft. Gresham is a 437th Maintenance Squadron aircraft hydraulics journeyman, 437th Airlift Wing. (U.S. Air Force photo/Staff Sgt. Katie Gieratz)