The Century Series is a popular name for a group of US fighter aircraft representing models designated between F-100 and F-106 which went into full production. They included the initial successful supersonic designs in the United States Air Force's service and would continue in active service manned aircraft well into the 1970s and 1980s with the Air Force Reserve and Air National Guard. Three later variants, the QF-100, QF-102 and QF-106 would also continue in drone service, primarily as aerial targets, until the late 1990s.