If you're currently not under contract for the US army, you can join the French Foreign Legion as long as you fit the mental and physical requirements and if you don't have a criminal record. If you do this, you can serve for the French army in the FFL for a minimum of 5 years. Once your 5 years contract is done (or if you're seriously wounded during service), you can obtain the French nationality.
With the French nationality, you can serve in the regular French army or keep serving in the FFL. However, you should check if the US accepts that its citizen enlist and fight in a foreign army. That may be considered treason.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.