Culvert Crawl
Army Staff Sgt. Mark Mercer crawls through a drainage culvert at the Fit to Win obstacle course during the Army Training and Doctrine Command Drill Sergeant of the Year competition on Fort Jackson, S.C., Sept. 9, 2015. Mercer is a Reserve drill sergeant assigned to the 98th Training Division. U.S. Army photo by Sgt. 1st Class Brian Hamilton

Photo by: U.S. Army Sgt. 1st Class Brian Hamilton |  VIRIN: 150909-A-OY832-006.JPG