Blue Scout Junior

XRM-91

Mission Profile

The Blue Scout Junior (XRM-91) was a three-stage American military sounding rocket in the Scout family, developed as a probe vehicle for nuclear weapons effects testing in the upper atmosphere and near-space environment. Standing 8.8 m tall with a 0.8 m diameter and a liftoff mass of 1.95 tonnes, it generated 156 kN of first-stage thrust. First flying in September 1960, the Blue Scout Junior was used by the US Air Force for high-altitude nuclear effects research and other classified programmes during the early nuclear testing era.