IT-21Information Technology for the 21st Century (US Navy IT program to improve shipboard communications and computing capability)
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Its predecessor, GOTS Delta, was built on the Windows NT architecture and defined as the standard by the IT-21 initiative.
COMPOSE, or Common PC Operating System Environment, is the new shipboard network (encompassing servers and personal computer clients) that the Program Executive Office for Command, Control, Communications, Computers and Intelligence (PEO C4I) PMW 160 is fielding to replace the IT-21 afloat system.