The Lockheed X-17 was a three-stage solid-fuel research rocket to test the effects of high mach atmospheric reentry.

The first stage of the X-17 carried the rocket to a height of 17 miles (27 km) before burning out.

The rocket would then coast on momentum to about 100 miles (160 km) before nosing down for reentry.

On April 24, 1957, an X-17 reached a speed of 9,000 miles per hour (14,000 km/h) at Patrick AFB.

The X-17 was also used as the booster for the Operation Argus series of three high-altitude nuclear tests conducted in the South Atlantic in 1958.