DMS was intended to replace the AUTODIN network, and is based on implementations of the OSI X.400 mail, X.500 directory and X.509 public key certificates, with several extensions to meet the specific needs of military messaging.
NREMS uses an AMHS backend to send secure Organizational Messages via a web interface to Naval commands.
The US Army's version of DMS is run solely on an AMHS platform both for CONUS and OCONUS operations.
The Pentagon Telecommunications Center (PTC) is the hub for CONUS operations and there are several AMHS sites OCONUS for strategic messaging.
In the tactical environment the Army deploys an independent Tactical Message Systems (TMS) that is also built on an AMHS platform for secure messaging capability in austere environments when communications with OCONUS AMHS sites are unavailable.