I was a controller in Canberra from '78 to '88 and the following applied to 34 SQN aircraft:
The two HS748's were NLA and NLB
The three Falcon 20's were NLD, NLE and NLF
And the two BAC 111's were NLG and NLH
When they were flying internationally ie one of the BAC's to NZ, then they used "AUSY ----" with the aircraft "A" hull number
The 5 SQN Helo's went by the name "EAGLE ----"