In a case that had worried US officials over a possible repeat of the hugely damaging Edward Snowden leaks, Harold Martin had piled up in his home and car an estimated 50 terabytes worth of data and documents, including reportedly sensitive tools for hacking foreign governments' computers, that he removed from the leading US electronic spying agency over a 20 year period.
Martin was charged with 20 counts of "wilful retention" of national defense information, in violation of his contract commitments against removing classified information from the NSA.
"Martin allegedly violated the trust our nation put in him by stealing and retaining classified documents and other material relating to the national defense," said Acting Assistant Attorney General Mary McCord in a statement.
"Insider threats are a significant danger to our national security and we will continue to work relentlessly with our law enforcement and intelligence partners to identify, pursue and prosecute such individuals."
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Martin, a former member of the US Navy, worked for the NSA through different contractors, including Booz Allen Hamilton, the same company that hired Snowden to work at the NSA.
Despite reports to the contrary last year, the indictment made no suggestion that Martin had divulged any of the materials he had taken.
But the embarrassment of the case was said to be behind pressure late last year on NSA chief Admiral Michael Rogers' removal. Rogers though has been retained in his position in the new government of President Donald Trump.
The materials came from the NSA, the Central Intelligence Agency, and the military's US Cyber Command.
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