I've heard Units in the Boston area ID a number of ways. Mass Alpha ###, M.A. Alpha ###, Massachusetts Alpha ###, 1 Alpha ###. I guess it kinds of depends on the Agent and how long he's been using the radio and what he's used to using. So I imagine that they could use C.A. Whiskey ###, California Whiskey ###, CAL Whiskey ###, 7 Whiskey ###. As long as Charlie 100 knows who he's talking to all is good.