ROYAL AIR FORCE MILDENHALL, England -- An E-4B National Airborne Operations Center visits Royal Air Force Mildenhall, England, April 12, 2023. The NAOC aircraft has several missions, both operational and training, which require travel to a wide variety of locations, both within the United States and around the world. (U.S. Force photo by Karen Abeyasekere/This image has been altered for security purposes).