By 2266, this new uniform had been made official and the older one was dropped. (TOS episode: "The Corbomite Maneuver") Despite the eventual majority of Starfleet who wore these uniforms, the process of replacing every vessel's uniforms took time, with some individuals wearing the older uniform type for years afterwards. For example, Starbase 47's personnel had received the new uniforms in 2265, but the USS Enterprise had not when they visited the station. A year later, in 2266, the Enterprise crew was wearing the new issue when they met the crew of the ill-fated USS Antares, who had continued with the old design. (VAN novel: Harbinger; TOS episode: "Charlie X")