Scout X, also known as Cub Scout, was an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 rocket which served as a prototype of the Scout, which was launched on a single test flight in 1960. It was used to test the configuration that later Scout rockets would use as well as two of the solid rocket motors that would be used on them.

The Scout X had the same configuration as the Scout X-1

Scout X-1

Scout X-1 was an American expendable launch system and sounding rocket which was flown seven times between August 1960 and October 1961. Four orbital and three suborbital launches were made, with four of the launches resulting in failures....

, which would be the first all-up version of the Scout. Unlike the X-1, which had four live stages, the Scout X only had live first and third stages, with battleship

Battleship (rocketry)

In rocketry, a battleship is a non-functional rocket or rocket stage which is used to test configuration and integration of a launch vehicle.The term should not be confused with the term boilerplate, which refers to a non-functional spacecraft....

 mockups of the second and fourth.

It was launched from Launch Area 3

Wallops Flight Facility Launch Area 3

Launch Area 3 at the Wallops Flight Facility is a launch complex which was used, mostly by Scout rockets, between 1960 and 1985. Forty one Scout launches occurred from the complex, making both orbital and suborbital. In addition, four Nike sounding rockets were launched from the complex in...

 at the Wallops Flight Facility

Wallops Flight Facility

Wallops Flight Facility , located on the Eastern Shore of Virginia, is operated by NASA’s Goddard Space Flight Center, primarily as a rocket launch site to support science and exploration missions for NASA and other U.S. government agencies...

at 23:09 GMT on 18 April 1960. The launch failed when the rocket disintegrated during stage separation.