It depends on whether this armor (Badbru's question still applies) is from a government source or a private one.
In the case of the former, the amor is likely to be something that was, at one time, part of the U.S. military's operational inventory. It could also be an AFV captured for evaluation purposes (quite a bit of Soviet armor was captured in Kuwait/Iraq, gifted or purchased from former Warsaw Pact nations, or given to the U.S. by Israel). That's a wide range of options right there.
If it's from a private collection, it could be almost anything from anywhere.
If you can narrow down the requirements a little bit more, I can give you some specific makes and models to consider.
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