Nobody really knows how much an entirely new military branch will cost the United States.

Space Force Conundrum

According to a report submitted by the Congressional Budget Office (CBO) last week, the U.S. military's proposed Space Force could rack up $1.3 billion in additional costs per year — far higher, points out, than the $500 million a year previously projected by the Department of Defense.

The Pentagon however, challenged the report's estimates. A Department of Defense spokesperson told SpaceNews that "the establishment of the United States Space Force is a small investment to ensure American leadership in space," pointing out that the estimates were "based on different assumptions."

Sticker Shock

Earlier this year, the Trump administration filed its budget request for 2020, including funding for a Space Force, a Space command for the new branch, and a Space Development Agency. Also included: a request for approximately $270 million for a Space Force headquarters.

But thousands of new hires could hike up the overall costs to between $1.1 and $1.9 billion, according to the CBO's report.

Home on the Range

Prior estimates of the costs of establishing a Space Force have ranged from $13 billion over five years by Air Force Secretary Heather Wilson to just $2 billion over the same time period, suggested by acting Defense Secretary Patrick Shanahan.

That massive range underlines just how little Congress knows about the desired scope and scale of creating a new military branch.

"The administration has provided few details about what the three organizations that it has proposed would look like or how large they would be," reads the CBO's report.

READ MORE: Congressional Report: Space Force Would Cost Billions More Than DoD Estimated []

More on Space Force: Former General: Canada Should Start Its Own Space Force

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