U.S. Air Force 633rd Dental Squadron dental residents practice performing simple interrupted sutures on cow tongues in the USAF Hospital Langley dental clinic at Langley Air Force Base, Va., Sep. 25, 2014. Residents often work with dental clinic patients during their training; however, the techniques they practiced on the cow tongues are preparatory for more advanced, emergency operations. (U.S. Air Force photo by Airman 1st Class Devin Scott Michaels)