On 29 January 1951, "Sydney" was part of an eighteen-ship fleet present in Sydney Harbour to celebrate the 50th anniversary of Australia's Federation. Following this, the carrier joined a multinational training exercise in south-east Australian waters, then visited Hobart for the Royal Hobart Regatta. During the exercise, a Sea Fury accidentally fired four practice rockets into the superstructure of the New Zealand flagship, : although an inquiry concluded that the pilot had unintentionally pressed the fire button, it was later found that certain signal frequencies transmitted by "Sydney"s radio aerials could trigger a Fury's firing circuits. "Sydney" was presented with the Gloucester Cup in April 1951, recognising her as the most efficient ship in the RAN for 1950. The two CAGs were switched over in April, and on 3 May, a Sea Fury crashed during a rocket-assisted take off; the pilot became the carrier's first fatality.