NO! I know alot of guys on this forum will tell you otherwise, they must know something the US border patrol doesn't.

There is NO law against foreigners training in the US. If there were, the BATF would be encouraging us to break the law with their FORM 6, which enables you to bring your own gun down with you. Some companies only train US citizens, they have the right to train or not train who they want.
Alot of guys on this forum have made the trip to Camden, legally. I'm heading back down next weekend, until November. I know for a fact there will be guys there from at least three other countries.
The United Sates isn't the dark scary, feriner hatin', hole alot of people up here make it out to be. Take a trip down, you won't want to come home!