U.S. Marine Corps Gunnery Sgt. Zachary Reilly, Instructor, Motor Transport and Maintenance Instructional Company (MTMIC), Logistics Operations School (LOS), Marine Corps Combat Service Support Schools, instructs Marine students how to reassemble a valve body on a transmission during a practical application exercise aboard Camp Johnson, Oct. 19, 2013. The instructors MTMIC, LOS instruct their students to disassemble and reassemble that General Motors 4L80 Echo Transmission so they will be more proficient within their military occupational specialty while serving in the Fleet Marine Force. (U.S. Marine Corps Combat Camera photo by Sergeant Mark E. Morrow/Released)