Jack O,
We use to have a military GCA unit here at FWA, and believe me we threw a party when they finally left. You would give them a flight on base or final, tower would tell them cleared to land ONLY, and more than half the time they did something else, thus causing all kinds of havoc.
We do Survelliance approaches to three of our runways, but having to do one in an actual emergency is rare.
Mike