Some B-1 Bombers Return to Flight Following Fuel System Inspection A U .S. Air Force B-l B Lancer assigned to the 37th Expeditionary Bomb Squadron, deployed from Ellsworth Air Force Base, South Dakota, takes off from Andersen Air Force Base, Guam, Nov. 16, 2017. (U.S. Air Force/Airman 1st Class Christopher Quail) 6 May 2021 Some B-1B Lancer bombers have returned to flight operations after officials grounded the fleet last month over a fuel system issue. The first aircraft resumed operations this week, Air Force Global Strike Command said in a news release Thursday. The command did not provide the exact number of Lancers that have returned to their missions following the safety stand-down or how many were affected by the fuel system issue, citing operational security.