Helicopter Training Squadron 18 (HT-18) is a United States Navy helicopter training squadron based at Naval Air Station Whiting Field in Milton, Florida. The squadron, nicknamed the "Vigilant Eagles", is responsible for giving prospective naval aviators their Advanced Helicopter Training. The squadron also provides rotary-wing training and designation to selected members of various allied nations, refresher and transition training to fleet aviators, and indoctrination flights for mid-shipmen, and flight surgeons. HT-18 flies the TH-57 SeaRanger.