UNIT Central Control
UNIT Central Control co-ordinated UNIT operations from Geneva. Alistair Gordon Lethbridge-Stewart reported to them during the Cyberman invasion in the late 20th century (TV: The Invasion) and threatened to contact them other times.
When a Third World War seemed inevitable, Central Control sent an alert to all UNIT national headquarter, informing them of the global situation and telling them to go on high alert. (TV: Day of the Daleks)