Spc. Doxton Johnson, Company C, 3rd Brigade Special Troops Battalion, 3rd Advise and Assist Brigade, 1st Cavalry Division climbs the Sapper Tower with a 40-pound ruck sack before conducting a six mile foot march at Contingency Operating Base Adder, Iraq, Sept. 15. The tower was constructed in front of the company headquarters building on COB Adder and serves as both an inspirational motivator and training device for combat engineers training for Sapper School.