Mil-std-1777

"The Internet Protocol (IP) and the Transmission Control
Protocol (TCP) are mandatory for use in all DoD packet switching networks
which connect or have the potential for utilizing connectivity across network
or subnetwork boundaries. Network elements (hosts, front-ends, bus interface
units, gateways. etc.) within such networks which are to be used for internetting shall implement TCP/IP. The term network as used herein includes
Local Area Networks (LANs) but not integrated weapon systems. Use of TCP/IP
within LANs is strongly encouraged particularly where a need is perceived for
equipmant inter-manageability or network survivability. Use of TCP/IP in
weapon systems is also encouraged where such usage does not diminish network
performance."