For several GOP lawmakers, the decision on whether to vote for the debt deal hinged on how the prescribed cuts will affect defense spending. In the end, enough Republicans in the House put their concerns about cutting the deficit over their concerns about cutting defense spending. But no one really knows how much the Pentagon will have to cut as a result of the deal or when. "We are in uncharted territory here," said David Berteau, an expert on budgetary issues with the Center for Strategic and International Studies. He says the Pentagon hasn't had this much uncertainty about its budget since the end of the Cold War.