Ted Cruz ADS-B Bill Moves to a Vote
avweb.com
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There’s significant amounts of airspace set aside for military use. They can turn off the transponder there.
When operating in congested terminal area airspace they need to follow the same rules general aviation, air taxi and airlines follow. They aren’t performing unique maneuvers in these areas.
It’s particularly important for low flying aircraft to have transponder enabled, sometimes referred to as secondary radar. It’s more effective than primary radar, which has limited low altitude coverage. And only ATC can track a target by primary radar.