RTV-G-4 Bumper

The RTV-G-4 Bumper was a sounding rocket built by the United States. A combination of the German V-2 rocket and the WAC Corporal sounding rocket, it was used to study problems pertaining to two-stage high-speed rockets. The Bumper program launched eight rockets between May 13, 1948, to July 29, 1950. The first six flights were conducted at the White Sands Missile Range, the seventh launch, Bumper 8 on July 24, 1950, was the first rocket launched from Cape Canaveral.
Bumper program.
The Bumper program was conceived in July 1946 by Colonel Holger N. Toftoy. It was started on June 20, 1947, to:
Overall responsibility for the Bumper program was given to the General Electric Company and was included in the Hermes project. The Jet Propulsion Laboratory was assigned to perform the theoretical investigations required, design the second stage, and create the basic design of the separation system. The Douglas Aircraft Company was assigned to fabricate the second stage, and do detailed design and fabrication of the special V-2 rocket parts required.
Six Bumper launches, as well as other V-2 test launches, were from White Sands Proving Grounds. In 1949, the Joint Long Range Proving Ground was established at Cape Canaveral Air Force Station on the east coast of Florida. The July 24, 1950, Bumper 8 launch was the first of hundreds of launches from "the Cape".