171011-NNH199-017 SAN DIEGO (Oct. 11, 2017) Katherine Sharp, a Biochemist at Naval Medical Center San Diego’s Comprehensive Combat and Complex Causality Care Gaits Lab shows Lt. Thatcher how prosthetic legs work. NMCSD C5 lab celebrated their anniversary in the courtyard with a variety of interactive and informational displays. (U.S. Navy photo by Mass Communication Specialist Seaman Apprentice Harley K. Sarmiento/Released)