Staff Sgt. Sebastiana Lopez Arellano, a patient at Walter Reed National Military Medical Center, does pushups during her therapy session at the center’s Military Advanced Training Center, which provides amputee patients with state-of-the-art care, in Bethesda, Md., April 13, 2016. Lopez lost her right leg and suffered several other injuries in a motorcycle crash in 2015. She now uses sports and fitness as part of her physical and occupational therapy regimen. (U.S. Air Force photo/Sean Kimmons)