By Julian E. Barnes 

WASHINGTON--House and Senate negotiators unveiled a compromise defense-policy bill Tuesday that would block a number of Pentagon proposals aimed at saving money while continuing to ban transfers of detainees from Guantanamo Bay to the U.S.

The bill would restrict President Barack Obama's ability to achieve his goal of shutting the prison in Cuba, but it includes several provisions he seeks, such as training moderate Syrian rebels, equipping the Iraqi security forces and stepping up military exercises in Europe.

The current authorization for training Syrian rebels expires Dec. 11, the day the House expects to adjourn its lame-duck session.

Lawmakers aim for a House vote on the bill by week's end. If it passes, the Senate is expected to vote on it next week, and it will go to Mr. Obama for his signature.

Detailing provisions of the defense-authorization bill to reporters, senior House and Senate staff members said the compromise allows some modest, one-year curbs to pharmacy copayments for military service members and to their housing allowance, but puts off long-term cuts until after a national commission on military competition releases a final report next year.

The bill would make some military savings more difficult. It would block retirement of the A-10 aircraft, although it authorizes the defense secretary to allow the Air Force to fly some aircraft less frequently or effectively ground them. That could allow the Air Force to move maintenance personnel to other aircraft.

The bill also would limit the Army's plan to retire older helicopters and move Apache attack helicopters from the National Guard to the active duty force in return for giving the reserves more Black Hawk helicopters. Aides said members of Congress want to await the result of an independent review before approving the transfer. But the measure doesn't completely block the Army, which will be allowed to move 48 helicopters.

Aides said many lawmakers want to hold off on retiring fleets of aircraft or helicopters next year in hopes that across-the-board Pentagon spending cuts can be rolled back and military spending increased.

The bill also seeks to open up more space launches to competition by blocking the use of some Russian-made engines purchased by United Launch Alliance, a joint venture of Lockheed Martin Corp. and Boeing Co. that has a contract to launch most of the Pentagon's spy, navigation and communications satellites.

The provision would ban the use of any Russian engines purchased after the Russian invasion and annexation of Crimea, congressional aides said. The bill also would provide $220 million for work on a U.S.-made replacement for the Russian engines.

"This is a way of addressing the competition concerns without rewarding the Russians for their behavior," said a Senate aide.

The aides said that provision would open up more launches to be bid on by SpaceX, a company co-founded by entrepreneur Elon Musk, and provide an incentive for United Launch to develop an alternative engine for the Atlas V rocket. But it will allow United Launch to continue to use some of the Russian engines they already have stockpiled. The joint venture took delivery of engines from their Russian supplier in October, and has said it has enough to last about two years, fulfilling its existing Pentagon contract.

SpaceX is on the cusp of being certified to carry some Air Force satellites into space on its Falcon 9 rocket but is still testing and developing the Falcon Heavy, which will be able to carry larger spy satellites into space.

Write to Julian E. Barnes at julian.barnes@wsj.com

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