Singapore defense officials visiting an Air Force Base in Arizona will get a look at a type of U.S. built fighters that the Asian nation may purchase. Luke Air Force Base officials say at least one F-35B from Marine Corps Air Station Yuma will fly into Luke today. Luke officials say the Singapore officials are at Luke for a training exercise being conducted at Luke and at the Barry M. Goldwater Range in southwestern Arizona. The F-35B is the short takeoff and vertical landing version of the F-35. It was developed for the Marine Corps and is configured differently than the F-35A version used by the Air Force. F-35A’s to be assigned to Luke are expected to arrive in early 2014.