Jeh Johnson, the Pentagon's top lawyer has resigned and says he will return to private practice. Johnson is leaving at the end of December after four years that included a number of controversial legal issues including the escalation in the use of drone strikes and the repeal of the Pentagon's ban on openly gay military service. He left the New York City-based law firm of Paul, Weiss, Rifkind, Wharton & Garrison, LLP, to take the Pentagon job, and is expected to return there.