“You give whores more money than you give me," a U.S. Navy criminal investigator complained in April 2012 to a contractor who was paying him for inside information on government contracts.

John Bertrand Beliveau Jr., a Naval Criminal Investigative Service special agent, pleaded guilty Dec. 17 to accepting bribes in exchange for prostitutes, luxury travel and cash as part of a major corruption case that involves hundreds of millions of dollars in Navy contracts, according to the Department of Justice.

Beliveau regularly searched the NCIS databases for confidential information that helped the contractor misdirect and avoid NCIS investigations into an over-billing scheme, according to his plea agreement.

The agent was stationed in Singapore when he began accepting bribes from Leonard Glenn Francis, chief executive of Singapore-based Glenn Defense Marine Asia. He continued after returning to the U.S., where he was stationed in Quantico, Va.

In return, Francis gave Beliveau envelopes of cash; paid for luxury travel to various locations in Asia; and gave him lavish outings to nightclubs that involved expensive dinners and alcohol, prostitutes and entertainment, according to the government.

But apparently the bribes weren't always enough. After complaining about Francis paying prostitutes more than him, Beliveau added, "I can be your best friend or worst enemy."

The leaked information cost the Navy at least $7 million in overpayments for supplies and services for ships, according to the plea agreement.

Beliveau and Francis used techniques the agent learned as part of his NCIS training to cover up their arrangement, including creating covert email accounts, using Skype for calls and avoiding normal banking channels to transfer money, according to court records.

Suspicious investigators became aware of the scheme and began tracking Beliveau's movements. When Francis made a visit from Singapore to San Diego to see Navy brass, he was arrested. Beliveau was arrested the same day in Virginia.

Beliveau is one of five charged so far in the expanding bribery case. He is scheduled for sentencing on March 9. The others, three Navy commanders and a GDMA executive, have not entered pleas.