An Earth space agency, abbreviated UESPA, which launched early probes such as Friendship 1 and was still named as the authority behind Captain Kirk's Enterprise in the first year of its mission.
The United Earth Space Probe Agency, usually shortened to UESPA, is the Earth body that sponsored deep-space exploration in the years after first contact and that later sat alongside Starfleet.
It is first heard of in The Original Series. In Charlie X Kirk refers to UESPA headquarters, and in Tomorrow Is Yesterday he tells the twentieth-century pilot John Christopher that his ship operates under the authority of the United Earth Space Probe Agency.
The Voyager episode Friendship One establishes that the agency launched the Friendship 1 probe in 2067 to carry greetings and technical knowledge to other worlds. Its emblem and initials also appear on equipment and documents of the twenty-second century in Star Trek: Enterprise.