AT: "nt" The Gilliam was a shuttlecraft attached to the USS Enterprise in 2258.
In that year, upon the mobilization of all Starfleet cadets to respond to a distress call from Vulcan, the Gilliam was used to ferry cadets from Hangar 1 in San Francisco, to the Enterprise, which was docked at Starbase 1. (Star Trek)
Background information
The Gilliam originally appeared to be a Moore-type shuttlecraft with its nacelles attached to pylons on the ventral sides of the craft. However, in the reveal shot of the Enterprise it was a military shuttle with its nacelles attached to the dorsal sides of the hull.
This ship was named after the Script Supervisor, Dawn Gilliam. (citation needed • edit)