The Constellation program is gearing up as the shuttle winds down. But other shuttle replacements have been scuttled before.
But it could be the lull before the storm as lobbyists and lawmakers begin to weigh in on controversial cuts.
Should military spending be seen as a 'jobs program'?
Although built for battle, these inventions are perfect in peacetime.
A successful landing and Mars's smooth surface sets optimum digging conditions
The 'jeep of the future' is expected to be safer for troops and more fuel efficient.