No. 2 Operational Conversion Unit (No. 2 OCU) is a fighter training unit of the Royal Australian Air Force (RAAF). Located at RAAF Base Williamtown, New South Wales, the unit trains pilots to operate the McDonnell Douglas F/A-18 Hornet, conducts refresher courses for pilots returning to the type, and trains future Hornet instructors. Pilots new to the Hornet enter No. 2 OCU after first qualifying to fly fast jets at No. 79 Squadron and undertaking initial fighter combat instruction at No. 76 Squadron. Once qualified on the F/A-18, they are posted to one of No. 81 Wing's operational Hornet units, No. 3 Squadron, No. 75 Squadron or No. 77 Squadron.