I want to join a foreign army. What should I do?

First of all, you must understand that if you don't have the nationality of these countries, you are not qualified to join their regular army. France has a famous foreign corps, which is one of the ways for foreigners who want to join French nationality to obtain visas quickly, that is, to serve in the corps for 5 years or in the war zone for 2 years. But these "special forces" you mentioned are very demanding, not only to master more than two foreign languages, but also to be born in excellent troops.

As for the mercenaries you mentioned, they don't belong to the national regular army, but to private security companies. If you are captured, they can't enjoy the treatment of prisoners of war and are not protected by the Geneva Conventions. You will be shot immediately. Friend, if you want to fight for your life, you can try.