More overt in its intended purpose is the HTV-2, a DARPA program that is experimenting with an expendable vehicle
designed to hit speeds of Mach 20 and above, then slam into a target.
In principle, this involved adding wings, tail, cockpit, landing gear, and heat shield to an otherwise expendable vehicle
. One does not need to be a rocket scientist to appreciate that an aeroplane is a much more practical and economical form of transport than a ballistic missile.
Rahmani supports NASA's Launch Services Program by working on expendable vehicles
such as the Pegasus XL and Falcon 9.
Dealing with the more recent era, the third section focuses on the return to flight after the Challenger accident and the development and flight of various types of expendable vehicles
launched from the Cape.
The next phase is to develop expendable vehicles
, said Hudson.