By Doug Cameron 

Boeing Co. and Lockheed Martin Corp. face the potential loss of hundreds of millions of dollars if U.S. lawmakers succeed in a push to ban future purchases of Russian-made rocket engines used by the companies to launch Pentagon satellites.

The compromise defense bill published late Tuesday would block the use of the rocket engines by the companies' United Launch Alliance joint venture unless they were bought before Russia's annexation of Crimea this year.

The bill could also delay the keenly awaited award of a contract for a new Navy drone and blocks several efforts by the military to retire older equipment, though approved total spending on weapons buying and development close to the level sought by the Pentagon for fiscal 2015.

While many of the compromises agreed by the House and Senate had been telegraphed in advance, the provisions affecting ULA were tougher than many observers expected. The Pentagon has already accelerated efforts to develop a homegrown rocket engine to reduce its reliance on the Russian motor, and boost competition in a segment where ULA has enjoyed a near monopoly for almost a decade.

ULA has said it has a two-year stockpile of the engines, but has been in talks to boost purchases of the Russian-made RD-180 rocket engine for its Atlas rockets to eight a year from five, and intended to use them for several years while it develops a new motor, which isn't expected to be ready before 2019.

The company said in a statement that "any effort to cut off the RD-180 before a new, reliable engine is available would result in billions of increased costs to the U.S. taxpayer and will leave the nation with a huge gap in national security capabilities."

Boeing earned $545 million over the past three years from its 50% stake in ULA, according to regulatory filings. ULA also launches satellites with a Delta rocket powered by U.S.-made engines. Lockheed earned almost $300 million from its share in 2013, but doesn't break out a direct contribution in earlier years.

Boeing and Lockheed executives are due to speak at an investor conference in New York on Wednesday.

Both companies are competing separately for the next development stage of the Navy's proposed UCLASS drone, alongside Northrop Grumman Corp. and General Atomics. An award had been expected as early as next year, but amid an intense debate over what the drone should do, the bill called for a report from the Navy on its options in fiscal 2017.

The bill did provide a boost for Boeing in providing funds for additional E/A-18 jets for the Navy, and called for the service to retain 11 aircraft carriers, including the refueling rather than retirement of the USS George Washington, work that would be undertaken by Huntington Ingalls Industries Inc.

Total procurement funding was pegged at $91.4 billion for fiscal 2015, above the $89.5 billion requested by the Pentagon.

The bill also overturns efforts by the Air Force to start retiring its A-10 combat jets, though included a provision for some to be shifted from front-line operations to free up maintenance staff to work on Lockheed's F-35 fighter. The Air Force had said personnel shortages could threaten efforts for the Air Force to have the F-35 combat ready in 2016.

The Air Force is also eager to advance efforts to replace its aging fleet of jet trainers, but the bill also called for the service to examine using privately-owned light jets under a lease arrangement for training purposes.

Lawmakers aim for a House vote on the bill the week. If it passes, the Senate is expected to vote on it next week and it will go to President Barack Obama for his signature.

Write to Doug Cameron at doug.cameron@wsj.com

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