Bumblebee originally concentrated on a ramjet powered design, and the initial Applied Physics Lab PTV-N-4 Cobra/BTV (Propulsion Test Vehicle/Burner Test Vehicle) was flown in October 1945. The Cobra eventually emerged as the RIM-8 Talos, which entered service on 28 May 1958 aboard the USS Galveston. As part of the development program, several other vehicles were also developed. One of these developed into the RIM-2 Terrier, which gained operational status on the USS Canberra on 15 June 1956, two years before the Talos. The Terrier was later modified as a short-range missile system for smaller ships, entering service in 1963 as the RIM-24 Tartar. Together, the three missiles were known as the "3 T's".