Senior Airman Mercedes Zanath, right, and Staff Sgt. Cassandra Berthold, 4th Component Maintenance Squadron fuels systems technicians, lower an F-15E Strike Eagle external fuel tank at Seymour Johnson Air Force Base, North Carolina, April 13, 2021. A vertical tank storage system is used to store the fuel tanks until they are needed. (U.S. Air Force photo by Airman 1st Class Kimberly Barrera)