Yeshua told us to obey the law of the land (the governing council). The laws of our land are no speeding, no killing, no jay-walking, etc. But, another law of the land is being in the military. Here, you are obeying the Law of Land, by obeying the Governing Council in the ACT of war, defending your homeland borders, being sent off to protect your Allies. This is a place where literally millions of people can lose their lives by the Act of Killing in a matter of days, minutes, a single moment. This is still following the Laws of the Land by obeying the Governing Council that made the decision to either create war, become a part of war, or to help your Allies during war.
Now, is it really OK by God that war (a creation of men in power that costs the lives of many for the single purpose of being victorious and most powerful) causes millions of people to die?
Someone will be always be held accountable for causing war that leads to unnecessary murders. But as a member of the military under the regime of a Governing Council (Laws of the Land), technically, anyone that I would happen to end their life is held against those who created the war. Spiritually and then emotionally because you are connected to God, you will condemn yourself for being the instrument that ended those lives. God clearly knows you were obeying orders (Laws of the Land), but He works in such a personal way, He makes it known to you, those are also lives that He died for. And giving that burden to God, is very essential, to be able to live day after day in the Knowledge and Understanding of God's WORD. Especially, understanding your actions under the Laws of the Land, will haunt you, and should haunt those who created the war. They will haunt you, until you are Free and Able to give it over to God.
Even though the burden seems to fall upon you, you were under the Law of the Land. You are free as long as your actions were according to the principles of war and life/death. God does not hold it against you. But you must give it over to God.