Army pursues spectrum tool to help keep post locations secret February 16 The Army is developing a tool to monitor electromagnetic spectrum emissions to help prevent adversaries from geolocating teams in the field. (Staff Sgt. Armando R. Limon/Army) WASHINGTON — The U.S. Army is working on a new tool to provide a much needed visual of the signals that command posts and units leak into the electromagnetic spectrum, possibly giving away their location. Demonstrations by sophisticated nation-states in recent years have made clear the detriment of big, static command posts or units with large electromagnetic spectrum footprints. Nation states have geolocated units based on their electromagnetic spectrum emissions alone and been either jammed or fired upon. The Russians demonstrated this to great effect in Ukraine.