All the Sqn call signs are published in the GPH 204, it's unclas. Talon XX for 423 Sqn is not a tactical call sign, it's more of a means for ATC to know who we are without having to say "This is Sea King Can Force 2407" like civvie pilots do. We still get asked from time to time about our type, but in places like Halifax, they know who you are just by your call sign. Tactical call signs are used only in the green (secure voice), when operating tactically in the red, we use alphanumeric daily changing call signs. At least that's how we operate in MH. We also use different call signs at sea when talking to the ship in the green, Talon is only used for domestic flying, we also use it in the US.