From left, Army Col. Michael Heimall, director of Walter Reed National Military Medical Center in Bethesda, Md.; Air Force Col. (Dr.) Jeffrey Bailey, Walter Reed’s director for surgery; Dr. Paul Pasquina, Walter Reed’s chief of orthopedics and rehabilitation; Dr. Justin Sanchez, director of the Defense Advanced Research Projects Agency’s Biological Technologies Office; and Lt. Col. (Dr.) Keith Myers, director of Walter Reed’s Amputee Clinic, pose for a photo at Walter Reed following a ceremony marking the delivery of a groundbreaking upper-limb prosthesis, Dec. 22, 2016. DoD photo