Talking of American callsigns:
Two Aussie Diggers find themselves in the "Talon" bar at "Camp Victory" at the Baghdad Airport during Operation Iraqi Freedom.
They befriend a couple of American Soldiers and invite them back to their camp for some beers.
So they leave the fortified American "Camp Victory" and wander over to the nearby Australian Camp. They walk through the security gate with an Australian flag and a modest sign reading "Camp Smitty".
Sitting down with a beer (not Fosters), one of the Americans turns to one of the Aussies and asks "So why is your camp called 'Camp Smitty'"?
The Aussie replies, "Well, it's because Smitty was the first bloke to camp here"