The short answer, from that short report: No idea.
“The administration has not detailed how it would use the authority that would be provided by this resolution; thus, CBO has no basis for estimating the costs of implementing [the resolution],” the report said.
The CBO is obviously limited in its ability to determine the price tag for an undefined military response. Despite the resolution, Congress doesn’t legislate specific defense tactics, and President Obama has fairly broad authority as commander in chief to conduct operations as he sees fit whenever force is authorized — and even when it’s not authorized, to some extent.
Even though Congress does not micromanage military actions, the Senate resolution attempts to set some guidelines for a potential strike on Syria. The measure would allow the president to use force for up to 90 days, but only after he shows that such a response is necessary. The administration would also have to lay out a strategy for negotiating a political settlement, review U.S. policy toward Syria and submit periodic reports on the progress of the military actions.
During testimony last week before the House Foreign Affairs Committee, Defense Secretary Chuck Hagel offered a ballpark estimate of how much the potential and yet-to-be-defined military action against Syria could cost.
“We have looked at the different costs, depending on the different options, depending on the decision the president makes,” Hagel said. “We have given some ranges of this. It would be in the tens of millions of dollars, that kind of range.”
Apparently, that’s as much precision as lawmakers and the American public will have for now.
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