RAF MILDENHALL, England -- U.S. Air Force F-16 Fighting Falcon aircraft assigned to the 555th Fighter Squadron, Aviano Air Base, Italy, were refueled by a KC-135 Stratotanker aircraft assigned to the 100th Air Refueling Wing, Royal Air Force Mildenhall, England, during a mission over the Black Sea, Jan. 14, 2021. U.S. military operations over the Black Sea enhance regional stability, combined readiness and capability with NATO allies and partners.