English: Red Flag is an advanced aerial combat training exercise hosted at Nellis Air Force Base, Nevada and Eielson Air Force Base, Alaska, the latter location being known as Red Flag – Alaska and being a successor to the previous COPE THUNDER exercise series. Since 1975, air crews from the United States Air Force (USAF) and other U.S. military branches and allies take part in one of several Red Flag exercises held during the year, each of which is two weeks in duration. The Red Flag exercises, conducted in four to six cycles a year by the 414th Combat Training Squadron of the 57th Wing, are very realistic aerial war games. The purpose is to train pilots from the U.S., NATO and other allied countries for real combat situations. This includes the use of "enemy" hardware and live ammunition for bombing exercises within the Nevada Test and Training Range.