A Fleet Replacement Squadron (FRS), is a unit of the United States Navy or Marine Corps that trains Naval Aviators, Naval Flight Officers (NFOs) and enlisted Naval Aircrewmen on the specific front-line aircraft they have been assigned to fly. Students, referred to as Replacement Pilots, Replacement Flight Officers or Replacement Aircrew are either newly winged aviators, aviators transitioning from one type aircraft to another, or aviators returning to the cockpit after a period of non-flying. After completing the training regimen, graduates are assigned to fleet squadrons. Additionally, FRSs are responsible for training aircraft mechanics, providing replacement aircraft for fleet squadron attrition, and standardizing maintenance and aircraft operations.

Strike Fighter Squadron 122 (VFA-122), also known as the "Flying Eagles", are a United States Navy F/A-18E/F Super Hornet and F/A-18 Hornet Fleet Replacement Squadron stationed at Naval Air Station Lemoore.