The United Earth Space Probe Agency (abbreviated UESPA) was an agency of the United Earth that's duty was to explore space and was later replaced by Earth Starfleet and then the Federation Starfleet.

The UESPA was involved in the construction of the Enterprise (NX-01) and aided the Earth Starfleet in other ways including the opening of the Coalition of Planets meeting.

The UESPA was still involved with the Federation Starfleet in the 2260s aiding in the operation of the USS Enterprise.

The Agency is also responsible for the launch of the unmanned Friendship One.

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