According to the interim budget, funding is frozen at the level of the previous year.

Politico writes about this with reference to sources in the US Department of Defense.

The U.S. Department of Defense has ordered the deployment of an additional carrier strike group, air defenses, fighter jets and hundreds of troops to the Middle East after the surprise terrorist attacks on Israel on October 7 to prevent the conflict from escalating into a regional war.

However, the dysfunction of Congress means that the Pentagon does not have the money to pay for a military build-up in the Middle East.

The military, like the rest of the federal government, operates under a temporary funding measure that freezes spending at the previous year's level. And because troop movements in the Middle East were not planned, the Pentagon had to withdraw money from existing operations and maintenance accounts, Defense Department spokesman Chris Sherwood said. This month, U.S. President Joe Biden signed an interim measure to keep the government open until lawmakers can agree on a spending bill for the entire year.

Since the Department of Defense had to look for funds, this means less money for training, training, and deployment that the military has already planned for the year. Some contract payments may be delayed, Sherwood said.

"Current events have revised some of the operational assumptions used to develop the President's fiscal year 2024 budget request. In particular, neither the baseline budget request nor the fiscal year 2024 supplemental request included funding for U.S. operations related to Israel," he said.

"We're getting it out of hiding," Sherwood added.

The military build-up in the Middle East, which included the expansion of the deployment of Gerald R. Ford's Carrier Strike Group operating off the coast of Israel, has forced military departments and U.S. Central Command to reconsider requirements for current and future operations based on the evolving conflict, he said.

"This burden is now heavier than usual on the Department of Defense, as the Pentagon supports two wars at the same time: in Ukraine and in Israel," the article says.

After the extension of the resolution ends on February 2, lawmakers must pass a spending bill for the entire year. But if the controversy drags on until April, the Pentagon and other federal agencies will face an overall 1 percent spending cut.

To recap, the United States is negotiating with Greece on the purchase of shells for Ukraine.