U.S. Air Force 1st Lt. Elspeth Theis practices using a nasopharyngeal tube on Dal Latsha during tactical combat casualty care training here March 12, 2015, as part of Operational Contract Support Joint Exercise 2015. Operational Contract Support is a military instrument of power during all phases of operations. Theis is a contract officer stationed at McConnell Air Force Base, Kan., and Latsha is a contract administrator at the Defense Contract Management Agency in Boston, Mass. (U.S. Air Force photo by Staff Sgt. Veronica Montes)