UNIT THREE was a division of the United Nations Intelligence Taskforce. During the Martian Invasion of 1997, groups were co-ordinated by UNIT ONE, the Creative Intelligence division of UNIT-US, while UNIT THREE served as liaison with NASA and the White House on the feasibility of a counterstrike against Mars. (PROSE: The Dying Days)
Major A Highway later reorgansied UNIT's "pan-territorial activities" into a "pivotal single base operation". (PROSE: UNIT's New York Operation Expansion)