The RAAF operated three marks of Neptune, (P2V4/5 and SP2H), 36 airframes in total. The P2vs entered service with 11 Sqn in the early 50s (1952-53?) and the sP2Hs with 10 Sqn in the early 60s (1962?). The P2Vs were before my time, but people who'd flown them told me they were not much more than Hudsons on steroids, but the SP2Hs were pretty capable ASW platforms in their day. They had a novel 'fuel dump' system - lighting up the two JP3s mounted outboard under the wings. This reduced fuel on board about as fast as any modern day fuel dump system!