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An F/A-18A Hornet assigned to the Flying Eagles of Strike Fighter Squadron (VFA) 122, a fleet replacement squadron for the F/A-18A and F/A-18D legacy Hornets, prepares to launch from the aircraft carrier USS Nimitz (CVN 68). Nimitz is underway conducting fleet replacement squadron carrier qualifications in the Pacific Ocean. (U.S. Navy photo by Mass Communication Specialist 3rd Class Ryan J. Mayes)

An F/A-18A Hornet assigned to the Flying Eagles of Strike Fighter Squadron (VFA) 122, a fleet replacement squadron for the F/A-18A and F/A-18D legacy Hornets, prepares to launch from the aircraft carrier USS Nimitz (CVN 68). Nimitz is underway conducting fleet replacement squadron carrier qualifications in the Pacific Ocean. (U.S. Navy photo by Mass Communication Specialist 3rd Class Ryan J. Mayes)

A Fleet Replacement Squadron trains the rookies on their front-line aircraft. Students, called Replacement Pilots or Replacement Weapon System Officers, are usually newly winged aviators or aviators changing planes. You also see this done with pilots who have not flown for a while. After training, the aviators will be assigned to a fleet squadron.