Everything a military does when it is in a foreign country (meaning, in a war) breaks the law of those countries as well. Should America ship off the troops it

Everything a military does when it is in a foreign country (meaning, in a war) breaks the law of those countries as well. Should America ship off the troops it asked to go fight in Country X to face justice for the war America started in Country X? This is a very immature view of how countries interact with each other.