Ground Mobile Forces (GMF) is the term given to the tactical SATCOM portion of the Joint Service program called TRI-TAC developed by GTE-Sylvania in the mid-1970s.
It is a joint service effort to develop and field advanced tactical and multichannel switched communications equipment.
The program was conceived to achieve interoperability between service tactical communications systems, establish interoperability with strategic communications systems, take advantage of advances in technology, and eliminate duplication in service acquisitions.
All of the GMF terminals have external connections for an AN/TSQ-111 Tech Control Facility, field phones, or a 70 MHz IF wideband input, plus are sealed for sustained operations in a chemical/biological/radiological (CBR) environment.
There were, however, a number of GMF terminals still supporting active forces in the extreme operating conditions of Iraq and Afghanistan.