The U.S. Air Force has ended its uninterrupted rotations of bombers to Andersen Air Force Base on Guam, which have been ongoing since 2004, as it shifts to a less predictable concept of operations. Five B-52H Stratofortresses left yesterday with no replacement aircraft in place, bringing an end to what the service had called the Continuous Bomber Presence Mission. This notably came just days after the bombers took part in a massive "elephant walk" readiness drill that also involved six KC-135R aerial refueling tankers, an RQ-4B Global Hawk drone, as well as a U.S. Navy MQ-4C Triton drone, and an MH-60S Sea Hawk helicopter, which was seen as a significant statement of American resolve aimed China.