Tech Sgt. Kasey Hollinger, a 432nd Maintenance Squadron aerospace ground equipment craftsman, stands next to a self-generating nitrogen cart May 19, 2015, at Creech Air Force Base, Nev. The self-generating nitrogen cart is used to separate the nitrogen from the oxygen in the air and compresses it to be used to inflate AGE equipment and aircraft tires. (U.S. Air Force photo/Senior Airman Adarius Petty)