U.S. Air Force Staff Sgt. Brendan Smith, 351st Air Refueling Squadron boom operator, refuels a U.S. Air Force F-15E Strike Eagle aircraft, assigned to the 48th Fighter Wing, Royal Air Force Lakenheath, England, during the Combined Joint All-Domain Command and Control demonstration off the Swedish coast, Feb. 25, 2021. European partners and U.S. forces continue to conduct engagements and multinational exercises, which enhance interoperability to improve regional cooperation, maritime security and stability in the region. (U.S. Air Force photo by Tech. Sgt. Emerson Nuñez)