This uniform lasted from before 2254, to provisionally at least 2268. In the 2250s, a previous uniform design was also being used concurrently with this one at least until 2256. (DIS: "The Vulcan Hello") This uniform was used by the crews of the USS Enterprise, the Antares and officers visiting Deep Space K-7. (TOS: "The Cage" , "Where No Man Has Gone Before" , "Charlie X" , "The Trouble with Tribbles" ) Beginning in 2265, the uniform began to be replaced by a new design. (TOS: "Friday's Child" , "Dagger of the Mind" )