Michael F. Shanahan Sr.has been named as nonexecutive chairman of the board of directors for Engineered Support Systems Inc. (St. Louis).

Comstock Canada Ltd., (Burlington, Ontario, Canada) has hired Barry Welsh as chief financial officer.

John Dunleavy, executive vice president of Pierce Associates, Inc., has been named chairman of the Contractors and Unions Seal of Excellence (CAUSE) for the 2005-2006 term.

EMCOR Group Inc. (Norwalk, Conn.) has named Joseph A. Puglisi as vice president. He will retain his position as chief information officer, also.
EMCOR Facilities Services (EFS, Arlington, Va.) hired Edward Dabrowski as chief financial officer and senior vice president and Michael Bordes as vice president and general manager of EFS Mobile Services group.