U.S. Air Force Airman 1st Class Hunter Goodan, a loadmaster with the 165th Airlift Squadron, Kentucky Air National Guard, demonstrates how an oxygen mask works in case of an inflight emergency for U.S., Canadian and Italian soldiers at Ramstein Air Base in Germany Sept. 3, 2014, during exercise Steadfast Javelin II. Steadfast Javelin II is a NATO-led exercise designed to prepare U.S., NATO and international partner forces for unified land operations.