This was the day I took the oath to defend the United States and signed my name to become a US Navy sailor.
The 1789 enlistment oath was changed in 1960 by amendment to Title 10, with the amendment (and current wording) becoming effective in 1962. Today the oath is:
I, (______________), 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.