The jury deadlocked and reached no verdict on charges against a fifth defendant, according to the San Diego Union-Tribune.
The case has centered around Leonard Glenn Francis who admitted in 2015 to offering $500,000 in bribes to Navy officers.
Twenty-nine defendants have pleaded guilty. The scheme cost the Navy some $35 million.
Cmdr. Stephen Shedd pleaded guilty to bribery charges Wednesday, the U.S. Justice Department announced.
Robert Wilkie also criticized his old department as resistant to reform and stuck in the past.
Robert Gorsuch was indicted with eight other officers in 2017.
An extensive investigation could not substantiate that the allegations occurred, Army officials said.
The former California congressman fills in a key Pentagon leadership role that has proved troublesome in recent years.
Records show "Leonard G. Francis" was on former CNO Adm. Gary Roughead's "Personal A-list" of guests for his change-of-command ceremony in 2011.
The new timeline for the 10-year, $16-billion project has not yet been settled.
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