U.S. Army Sgt. Michael Lopez, a Los Angeles native

U.S. Army Sgt. Michael Lopez, a Los Angeles native and signal support specialist with Headquarters, Headquarters Company, 3rd Brigade Combat Team, 1st Infantry Division, Task Force Duke, swings a sledgehammer at a tire in the Forward Operating Base Salerno gym July 7. Lopez, a boxer, says this type of exercise works his upper body, and allows him to focus all his energy into a surge of power through his arms.