CHANTILLY, Va.--(BUSINESS WIRE)--Engility Holdings, Inc. (NYSE:EGL), today announced that David A. Savner has been designated by its Board of Directors to serve as co-chairman effective upon the closing of Engility’s anticipated acquisition of TASC, Inc., which is expected to occur during the first quarter of 2015. Mr. Savner will serve as non-executive co-chairman of the combined company with Peter A. Marino, the current chairman of TASC. Mr. Savner will succeed Engility’s current chairman, Ed