Greyhound Leader
From Tardis Wiki, the free Doctor Who reference
Greyhound Leader was a UNIT call sign which was used by Brigadier Alistair Gordon Lethbridge-Stewart. (TV: Robot, Terror of the Zygons)
It was also once used by John Benton when he answered on behalf of the Brig, (TV: Robot) and by Captain Clarke while the Brigadier and half of UNIT was away in Canada. (AUDIO: The Oseidon Adventure)
During the Nestenes' attempted invasion of Earth in the 1990s, Greyhound Leader was used by UNIT investigator Lockwood, (HOMEVID: Auton) as well as by special operative Ross Palmer (HOMEVID: Auton 3: Awakening)