 In 1942, after the United States entered WWII, the U.S. Army scouted for, and established, airfields nationwide for the purpose of training pilots and aircrew.Seven emergency airfield sites were developed in Mohave County and along the Colorado River, including what’s now known as Site Five and Site Six.In 1942, the U.S. military built the Havasu Auxiliary Airfield #6 to serve as an emergency landing strip as part of its World War II defense plan.