U.S. Soldiers assigned to the 1st Battalion, 23rd Infantry Regiment, 3rd Stryker Brigade Combat Team, 7th Infantry Division prepare to breach concertina wire during a simulated assault on an objective as part of a live-fire exercise at the Yakima Training Center, Wash., Oct. 12, 2013. The exercise was the battalion's capstone operation, concluding nearly a month of training in conventional fighting tactics and techniques.