Task Force Constitution was a United Federation of Planets Starfleet task force formed during the Four Years War and continuing into at lest the 2250s. (Star Trek: Avenger: "Early History of the USS Avenger")
At different times, at least four capital ships were part of this task force. In addition to USS Constitution (under the line and flag command of Garth of Izar), in the late 2250s, these were USS Saratoga, USS Avenger, and USS Illustrious.