By Doug Cameron 

Elon Musk's space venture suffered a double setback Tuesday after it postponed a high-profile launch of a reusable rocket and faced a further delay in its bid to launch satellites for the Pentagon.

Mr. Musk's Space Exploration Technologies Corp., or SpaceX, scrubbed the launch of a rocket carrying cargo to the International Space Station just before it was due to blast off from Cape Canaveral Air Force Base in Florida because of a technical glitch. SpaceX had planned to land part of the used rocket on a platform in the Atlantic, a first for the industry designed to show it could dramatically cut the cost of space launches.

Hours later, the U.S. Air Force said it hadn't certified a new entrant to challenge the near monopoly for national security satellite launches enjoyed since 2006 by a joint venture between Boeing Co. and Lockheed Martin Corp. SpaceX has aggressively pursued the military market. However, the Air Force said it was "close" to approving a competitor having previously flagged the process could be completed by December.

SpaceX is the only firm to seek the military work and has been involved in a fierce lobbying battle with the joint venture, known as United Launch Alliance LLC, and the Pentagon to win military work. It sued both earlier last year in an effort to break up an existing multiyear deal involving ULA and enter the market itself more quickly. A Pentagon spokeswoman declined to identify the new entrant.

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 Chief Executive Jeff Bezos.

In July, the Air Force opened a contest to launch one satellite in 2016 that could pit ULA against SpaceX, and the 2015 defense bill passed by Congress opens the way to a competition for a second launch.

The Air Force has said it is spending $60 million to certify the SpaceX rockets, but Gen. John Hyten said he wouldn't hesitate to preserve the existing monopoly if Mr. Musk's venture failed to satisfy the technical criteria.

"Although no new entrants were able to be certified by December 2014, a new entrant is close and we will continue to invest significant resources in a close collaborative effort on the certification process in 2015," Lt. General Samuel Greaves, Commander of the Air Force Space and Missile Systems Center, said in a statement.

The Air Force added it would take a closer look at its certification process for the future.

"I am directing a review of our new entrant certification process by an independent team to capture the lessons learned so we can enhance competition for launch services," said Secretary of the Air Force Deborah Lee James in a statement.

SpaceX had no immediate comment on the Air Force announcement. The firm said the postponed commercial launch from Florida 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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