WASHINGTON — Acting Defense Secretary Patrick Shanahan said he anticipates months of debate and negotiations with members of Congress over the standup of a new military branch for space.

In his first news conference on Tuesday at the Pentagon as acting defense secretary, Shanahan said he plans to continue to oversee the space reorganization that started last year when he was deputy secretary of defense. He mentioned Undersecretary of Defense for Research and Engineering Mike Griffin and Air Force Secretary Heather Wilson as his closest collaborators.

“The space effort is one area where I’ll continue to work with Secretary Griffin and Dr. Wilson,” said Shanahan. “I won’t be traveling as much.”

A proposal for the establishment of a U.S. Space Force is being finalized and will be sent to the White House for approval before it goes to Capitol Hill along with the budget request for fiscal year 2020. Inside the Pentagon, meanwhile, discussions continue on how to structure a Space Development Agency to be led by Griffin. “Internally, the focus is on ‘How do we go faster with delivering capability?’” Shanahan said.

For the first time Shanahan confirmed that the Pentagon is proposing to establish a Space Force within the Department of the Air Force. He suggested that this is the most efficient option to add a new branch without running up overhead costs. “When I go to the Hill to talk to members about where they have concerns or where their interests are, they are very focused on how do we not grow a bureaucracy, how do we not generate unnecessary cost.”

A White House policy memo agrees with the Pentagon’s recommendation to place the Space Force in the Department of the Air Force but directs DoD to continue to plan for the creation of a separate Department of the Space Force.

Shanahan is expecting some members of Congress to argue that the United States cannot afford the cost of standing up a new military service. “I think about the discussions we’re going to have over the next five to six months,” he said. His response to lawmakers’ concerns will be that the Space Force will be organized in a way that minimizes cost. “It’s going to be small, as small as possible a footprint,” Shanahan said. “That’s why it’s been recommended it sits under the Air Force.”

The Pentagon has not revealed any estimates of the potential size or cost of a Space Force. An independent study by the Center for Naval Analyses suggested a Space Force would have 16,000 to 19,000 combined active duty and military personnel. By comparison, the smallest military service today, the Marine Corps, has 186,000 active-duty troops and is organized under the Department of the Navy.

The thinking is that the Space Force will be small in size but heavy in technological might. Shanahan has been insistent that his immediate priority is to create a Space Development Agency to help inject innovation into military space programs and speed up the application of commercially available technology.

At the press conference, Shanahan did drop a bit of news: A four-star nominee has been selected to lead a new combatant command for space. “We do have a person that we’re going to move through,” he said, although he would not disclose the name of the nominee or the proposed location of the new command.

President Trump in a Dec. 18 memo instructed the Pentagon to establish a United States Space Command as a “functional Unified Combatant Command.”

In opening remarks, Shanahan said the transition from deputy secretary to acting Pentagon chief has been seamless. After 29 days on the job, he said, “the terrain is not different or new.”

Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...