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The AN/PSG-2 Digital Message Device is a portable data-entry terminal used by artillery forward observers to communicate with artillery batteries to request and control artillery fire missions. DMDs were first fielded as part of the TACFIRE artillery fire control system.
The original DMD allowed the user to conduct fire missions, develop fire plans, and send/receive freeform text messages. An enhanced version, the FIST (FIre Support Team) DMD, allowed a FIST Chief (usually an Artillery Lieutenant) to monitor the transmissions of his forward observers.
The accompanying illustration is from the Windows version of the MiniTSFO, a PC-based call for fire simulator developed in the late 1980s.
References
Digital Message Device Wikipedia(Text) CC BY-SA