What is the oath that all soldiers in the us military make?

There is only one branch of the U.S. Military where you can find "Soldiers" and that's the Army. To my knowledge I have only ever made one oath in the Army and that's the Oath of enlistment. My making the oath you are swearing into the U.S. and the U.S. Army.

I, (name), do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; and that I will obey the orders of the President of the United States and the orders of the officers appointed over me, according to regulations and the Uniform Code of Military Justice. So help me God.[