The USS Yeager (NCC-65674) was a Yeager-type Federation starship that was in service during the 2370s.
The Yeager served during the Dominion War, starting in 2373, where it was often stationed near Deep Space 9. (DS9: "Doctor Bashir, I Presume")
Background
According to the Star Trek: Deep Space Nine Technical Manual, the Yeager is a light cruiser powered by a 1500+ cochrane warp core feeding two nacelles and an impulse reactor system. It was built at the ASDB Integration Facility at Utopia Planitia on Mars.
This ship must have been commissioned sometime after Star Trek: First Contact since another USS Yeager was active then. This ship was seen in background scenes in several episodes. The configuration of this ship (a kitbash, in modeler slang) was created by using the primary hull and nacelles from a Revell-Monogram Intrepid-class Voyager model, attached to the rear hull of a Maquis raider model, although the parts differ from their original scale in relation to each other. Backstage photos reveal this model bears the name Yeager and the registry is NCC-65674. Both are easily made from the premade decals of the Voyager model (NCC-74656 was transposed into NCC-65674, and Y-A-G-E-R and an extra E from the original decals makes Y-E-A-G-E-R). The same procedure was performed on the model of the USS Trial, which was made from a USS Reliant model kit, thus turning R-E-L-I-A-N-T into T-R-I-A-L by removing the E and N and rearranging the rest of the letters. However, the registry starting with the digit '6' should indicate a ship that is older than the Voyager parts it is made from, unless the ship and hull registry are actually a predecessor of Voyager that resembles it, or if this registry just happened to be non-sequential for some other odd reason and the vessel was new circa 2373 (perhaps explaining the mix of old-style and new-style technology). The class name of this ship is unknown, it seems unlikely it would be its own prototype, so the previous fandom designation Yeager-class probably should not be used. The ship is pictured in the DS9 Technical Manual, however it is only referred to as Intrepid-class "variant," and its type and specifications identified.