USS Moncrief (NCC-3800) was the lead ship and prototype for the Moncrief-class transport/tugs on active duty in Starfleet during at least the 23rd century. The class was authorized in July, 2266. ((Jackill's Starfleet Reference Manual: Ships of the Fleet, vol. 1, 2006 revision)

In the mid- to late 2260s, Moncrief would undergo successful trials but Ptolemy-class ships would not be refit — nor new-build ships constructed — until linear warp drive was tested on vessels such as the Decatur, Intrepid and Enterprise.

The Decatur was the first Starfleet vessel to have linear warp drive. Per TOS novel: My Enemy, My Ally, the second Constitution-class Intrepid was a testbed for many upgrades that would later be implemented on Enterprise before the latter was relaunched in 2273.

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