Air refueling is a process that allows military aircraft to refuel in mid-air, extending their range and operational time. This technique involves a tanker aircraft transferring fuel to another aircraft using a hose and drogue or a boom system. It is essential for long missions, enabling planes to stay airborne without needing to land for refueling. The process requires precise flying and coordination between the tanker and the receiving aircraft. Air refueling is commonly used by various branches of the military, including the U.S. Air Force, to support missions such as reconnaissance, transport, and combat operations.