Homeworld security

Homeworld security was a mandate which UNIT adhered to in the early 21st century.

By the late 2000s, Martha Jones noted to the Tenth Doctor that UNIT received massive funding from the United Nations in the name of homeworld security, allowing them to construct the aircraft carrier Valiant. (TV: The Sontaran Stratagem)

Under this mandate, Sir Alistair Gordon Lethbridge-Stewart continued to work for UNIT as a special envoy as late as 2009, despite claiming to be retired. Alistair himself bemoaned the mandate; believing that the modern UNIT's problem was "too many buzzwords, too many directives", he recalled that in his day they maintained the benefits of common sense.

Major Cal Kilburne claimed that his only concern was homeworld security. Ironically, he was ultimately revealed to be an undercover Bane. (TV: Enemy of the Bane)