April 16 (UPI) -- A third top Pentagon official was placed on administrative leave Wednesday in the fallout of a major leak of sensitive U.S. military intel via a group chat on Signal. Colin Carroll, chief of staff to Deputy U.S. Defense Secretary Stephen Feinberg, was suspended and put on an undetermined administrative leave following a DOD probe into the incident, Politico and ABC reported. He was joined by Darin Selznick, DOD's deputy chief of staff, and a top adviser to U.S. Defense