Eretz yisrael is the only land where serving in the army means defending the safety of other Jews. If Chas Vshalom something goes terribly wrong and there is a threat to our safety, you don’t run. You stand up and defend our people and our mekokos hakedoshim.
In 48, 67 and 73 the yeshiva bochrim were supporting from the home front, volunteering in hospitals, helping to dig ditches etc. Let’s not let politics get in the way of hallacha. Defending the life of a fellow Jew at risk is an incredible mitzvah. Leaving and being poreish min hatsibur requires a serious posek.