army

Hello.
I am an ultra-Orthodox guy in a Lithuanian yeshiva. My friend and I are going to be drafted soon. I would be happy if the rabbi could answer some questions that came to my mind while dealing with the subject.
A. How can I go to the army when I know that I will not be able to observe the laws of war written in the Torah? The question is mainly about the prohibition on a married man fighting (I don’t know if there are other laws).
on. How is it possible that in the army they violate the Halacha I mentioned earlier and yet see great successes, since it is written in the Torah, “And turn back from behind you.”
third. What can be done to ensure that there is adequate representation for the right-wing public at the highest levels of the military? This does not seem likely. The reality is that there is a public debate about policies that affect life and death, and yet, in my opinion at least, there is no adequate representation for the right-wing side of the map in decision-making.