170426-N-OY339-274 SIGONELLA, Sicily (April 26, 2017) Medical personnel respond to a simulated casualty at Naval Air Station (NAS) Sigonella during an active shooter drill. NAS Sigonella is an operational ashore base that enables U.S., allied, and partner nation forces to be where they are needed and when they are needed to ensure security and stability in Europe, Africa, and Southwest Asia. (U.S. Navy photo by Mass Communication Specialist 2nd Class Christopher Gordon/Released)