You can use it in the Demo, line up your binoculars on the halftack, wait about 20 seconds and a Jug will fly over and deliver some ordanance right on top of it.
This is the only area it works, for some reaon you can't use it on the Tiger.
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Lady Astor: "Winston, if I were your wife I'd put poison in your coffee."
Winston Churchill: "Nancy, if I were your husband I'd drink it."