Military oaths

Military oath under Hitler:

The Wehrmacht Oath of Loyalty to Adolf Hitler, 2 August 1934 (Wehrmacht: the armed forces of Germany)

"I swear by God this sacred oath that to the Leader of the German empire and people, Adolf Hitler, supreme commander of the armed forces, I shall render unconditional obedience and that as a brave soldier I shall at all times be prepared to give my life for this oath."

US Military Oath

In the Armed Forces EXCEPT the National Guard (Army or Air)

"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."

How are these oaths similar? How are they different?