The RC-135 guys told of some “interesting” stuff seen while tickling the radars. Like circular polarizations switching sense, unknown frequencies momentarily popping up, etc. It seemed the Soviets had another set of operating freqs and transmission modes to switch on during war.
make all that collection data instantly obsolete if used to set up ECM pods.
The best one I heard was a low approach to a Russian aircraft carrier by the RC-135U. It sounds like this mission was to see the cooperation between Russia and Iran in case our bombers want to take a shortcut to Iran. Good stuff.