So are you saying frum people do not need to follow the law because there is a Ran who we do not pasken like?
It’s not so poshut that we don’t follow the Ran, or that the Rambam would apply to the secular State of Israel.
Whether frum people should or shouldn’t follow the law depends on the law. Joining the armed forces is a tremendous
sakana in ruchniyus, so no, someone shouldn’t go to the army just because it’s a law.