Members of the Polish army and air force observe U.S. Air Force Airmen conducting Negatively Pressurized Conex Lite training on a C-130 Hercules aircraft at Ramstein Air Base, Germany, July 28, 2021. Polish military personnel visited as a joint NPCL demonstration to train with U.S. forces to share knowledge on the equipment and enhance U.S. and Polish relations. (U.S. Air Force photo by Airman 1st Class Madelyn Keech)