D.C. bigwig

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Possible Answers: SEN.

Last seen on: –LA Times Crossword 7 Mar 21, Sunday
Eugene Sheffer – King Feature Syndicate Crossword – Oct 23 2020
Universal – Jan 14 2019
The Washington Post Crossword – Dec 12 2018
LA Times Crossword 12 Dec 18, Wednesday

Random information on the term “SEN”:

Prior to the advent of the satellite based Joint Network Node (JNN), the United States Army used a system known as Mobile Subscriber Equipment (MSE) in order to provide tactical battlefield communications. MSE is a Line-Of-Sight (LOS) terrestrial based communications system limited by terrain and distance. MSE is still in use in limited quantities.

The small extension node (SEN) is part of a US military communication system known as mobile subscriber equipment (MSE). A SEN is composed of two shelters, a switching shelter and a Line of sight radio terminal shelter(LOS)

A SEN switching shelter contains switching, multiplexing, and communications security (COMSEC) equipment for secure digital voice and data communications. A single switching shelter is mounted on the back of a HMMWV, powered is provided by a 10 kW diesel generator, and the SEN is operated by up to a six soldier team. To provide communications for a Corps area the Signal Battalion would deploy forty SEN’s, amongst Node Centers, Large Extension Nodes, and Radio Access Units.

SEN on Wikipedia