U.S. Navy Equipment Operator 1ST Class Jason Knifley (center), assigned to Naval Mobile Construction Battalion 1 (NMCB-1), serves as the crew leader as his team launches a medium girder bridge as part of a class exercise on Jan. 29, 2007. This class exercise is being conducted during the Medium Girder Bridge Course at Naval Construction Battalion Center Gulfport, Miss., in order to prepare NMCB-1 Seabees for their upcoming field exercises and any future deployments. (U.S. Navy photo by Mass Communications SPECIALIST 2nd Class Demetrius Kennon) (Released)