Such as? It is legal for Americans to fight for another country, unless it's against the US. In fact the US government said they can't intervene if one is forc

Such as? It is legal for Americans to fight for another country, unless it's against the US. In fact the US government said they can't intervene if one is forced to do compulsory military service abroad. It gets complicated fast: https://travel.state.gov/content/travel/en/legal/travel-legal-considerations/Advice-about-Possible-Loss-of-US-Nationality-Dual-Nationality/Loss-US-Nationality-and-Foreign-Military-Service.html https://travel.state.gov/content/travel/en/legal/travel-lega...