Pilots engage in Independent Pilot Off-station Procedures (IPOP) at Nellis AFB Published April 26, 2024 57 WG PA NELLIS AIR FORCE BASE, Nev. -- U.S. Air Force Maj. Zach Saunders, F-35 division commander assigned to the 422nd Test and Evaluation Squadron, performs post-flight checks on the tires of an F-35 Lightning II as part of independent pilot off-station procedures (IPOP) at Nellis Air Force Base, Nevada, April 1, 2024. Participating in IPOP allows pilots the opportunity to learn maintenance and refueling techniques, extending operational range. (U.S. Air Force photo by Airman 1st Class Brianna Vetro)