The 414th Combat Training Squadron (CTS) is a United States Air Force unit. It is assigned to the 57th Wing at Nellis Air Force Base, Nevada. The 414 CTS is a non-flying organization charged with hosting Red Flag - NELLIS (RF-N) exercises, Air Combat Command's premier and largest Large Force Exercise (LFE).The unit was originally formed as the 414th Night Fighter Squadron in 1943.