In September 1941 the first cadets of the Royal Air Force arrived. They trained in Stearman PT-17s and North American Aviation AT-6s. The good weather, wide-open desert terrain, and lack of enemy airpower provided safer and more efficient training than was possible in England. Even so, twenty-three British cadets, one American cadet and four instructors were killed and are now buried in the Mesa City Cemetery, along with several colleagues who have since died of natural causes. Several thousand pilots were trained there until the RAF installation was closed at the end of the war. The City of Mesa purchased the field from the U.S. government for $1.