As the world’s largest defense company gets even larger, Pentagon leaders worry that competition is evaporating.

The Pentagon’s top arms buyer worries that Lockheed Martin’s upcoming $9 billion acquisition of Blackhawk helicopter maker Sikorsky is part of a bad trend in which large defense firms get bigger and competition wanes.

The Defense Department will not block the purchase, but “we believe that these types of acquisitions still give rise to significant policy concerns,” Frank Kendall, undersecretary for acquisition, told reporters on September 30. “The Department of Defense is concerned about the continuing march toward greater consolidation in the defense industry at the prime contractor level.”

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