By Doug Cameron 

The U.S. Air Force said Wednesday that it expects to clear Elon Musk's space venture to launch satellites for the Pentagon by mid-2015, six months later than previously planned.

Mr. Musk's Space Exploration Technologies Corp., or SpaceX, has been aggressively pursuing the multibillion-dollar market for military and intelligence rocket launches that is dominated by a joint venture between Boeing Co. and Lockheed Martin Corp.

SpaceX resorted to suing the Pentagon in an effort to break up an $11 billion, multiyear deal for the joint venture, known as the United Launch Alliance LLC, or ULA. That case continues.

Congress has also been pushing the Pentagon to open up the market to competition following fierce criticism of the high cost of launches by ULA, though the joint venture has been taking steps to reduce them.

The Air Force on Tuesday said it had missed its own Dec. 31 deadline to certify a new entrant, and on Wednesday identified SpaceX, which it said had met more than 80% of the requirements.

"We expect to certify SpaceX no later than mid year, as we remain very optimistic since SpaceX continues to demonstrate the innate ability to innovate and quickly respond to open items." Lt. Gen. Samuel Greaves, commander of the Space and Missile Systems Center, said in a statement.

The Air Force has said it is spending $60 million to certify the SpaceX rockets, and though it gave no reason for the delay, said it would take a closer look at its certification process for the future.

The prospect of competition in space launches has been energized by concerns that ULA's reliance on Russian-made rocket engines could leave some U.S. military and spy satellites grounded if the venture can't secure more supplies or spares. ULA has said it has enough engines to last two years, and is developing a new, totally U.S.-made rocket engine in partnership with Blue Origin LLC, a venture founded by Amazon.com Inc. Chief Executive Jeff Bezos.

SpaceX had no immediate comment on the Air Force announcement. Separately, the firm said a commercial rocket launch postponed minutes before blast off on Tuesday could be rescheduled for Friday if the technical problems can be resolved.

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

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