A civilian employee of the National Security Agency has resigned after he was stripped of his security clearance for letting Edward Snowden use his personal log-in credentials to access classified information while an NSA contractor, an agency memo obtained by NBC News shows. Meanwhile, an active duty U.S. military member and a contractor have been barred from NSA facilities because they were implicated in actions that might have helped Snowden in his monumental leaks, according to the memo. The Feb. 10 memo was sent to congressional committees this week and gives the first official account of a sweeping internal NSA probe that seeks to identify who might have played a role in the Snowden leaks, which form one of the biggest security breaches in U.S. history. The memo's account is sketchy — but it suggests Snowden used an element of trickery to collect his trove of classified documents.
