Spc. Doxton Johnson and Pvt. David Poirier, engineers with Company C, 3rd Brigade Special Troops Battalion, 3rd Advise and Assist Brigade, 1st Cavalry Division begin the construction of the Sapper tower at Contingency Operating Base Adder, Iraq, Aug. 30. 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.