Digital Message Device
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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.
- AN/PSG-2A DIGITAL MESSAGE DEVICE, Personal Museum of Military Radios - Spy Radios - Tubes, By Antonio Fucci, Fano (Italy)