Upon being commissioned as CWO2, selectees underwent warrant officer indoctrination and then flight school for 18 to 30 months. After completion of flight school, selectees were placed in one of four types of squadrons: ship-based Helicopter Maritime Strike (HSM) or Helicopter Sea Combat (HSC) squadrons, and land-based fixed-wing maritime patrol and reconnaissance (VP) and fleet air reconnaissance (VQ). These pilots and NFOs were then trained to operate the P-3 Orion, the EP-3E Aries II, the E-6 Mercury, or variants of the MH-60 Seahawk. Those in the VP community would also eventually qualify to fly the P-8 Poseidon once that aircraft began replacing the P-3 in 2012. The Navy re-evaluated the program in 2011, when the last of the "flying" chief warrant officers reported to their operational fleet squadrons and opted to subsequently terminate the program. Enlisted sailors in the grades E-5 through E-7 who had at least an associate degree and were not currently serving in the diver, master-at-arms, nuclear, SEAL, SWCC, or EOD communities were eligible to apply.