Marines want a Space Plane

Getting a small force anywhere in the world in under two hours has always been the dream. The Marines may be pushing too hard to get a ship that can get them out too.

More and here. The Lexington think tank is skeptical.

It is pointed out in a status report that any platform to deliver troops also could be a hypersonic platform to attack bases with missiles or similar weapons anywhere in the world on short notice without the problems of long flight times or refueling.