Marines in Spaaaaaace! describes “the U.S. Marine Corps’ futuristic plans to deploy through space”:
The effort is called Hot Eagle, and it could be the first step forward in the Marine Corps’ hopes for space travel. Within minutes of bursting into the atmosphere beyond the speed of sound — and dispatching that ominous sonic boom — a small squad of Marines could be on the ground and ready to take care of business within 2 hours.
I should point out that Heinlein’s Starship Troopers has been on the Marine Corps’ doctrine, training, and tactics reading list for some time.