u.s. president-elect donald trump announce two appointments national security council thursday retire army lieutenant general keith kellogg chief staff executive secretary former fox news channel analyst monica crowley senior director strategic communications kellogg serve vietnam war work private sector since retire army 2003 say statement trump transition team statement say crowley foreign affairs political analyst fox news channel fox news spokeswoman say crowley contract terminate two serve michael flynn retire general trump early name national security adviser trump tap retire general tv analyst nsc post