A U.S. Air Force Airman assigned to the 633rd Security Forces Squadron patrols Third Port during exercise Operation Resolute Endeavor II at Joint Base Langley-Eustis, Va., Dec. 5, 2016. U.S. Army, Navy and Air Force members participated in the five-day exercise, which tested each branch’s skill sets, interoperability and communication. (U.S. Air Force photo by Airman 1st Class Derek Seifert)