You may not have taken it but you could have googled it.
“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.” (Title 10, US Code; Act of 5 May 1960 replacing the wording first adopted in 1789, with amendment effective 5 October 1962).
So what was changed?
I remember taking MY oath May20,1958 and it went something like this:
“I, A.B., do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign or domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter. So help me God.” This version remained in effect until the 1959 adoption of the present wording.
Found at: http://www.history.army.mil/html/faq/oaths.html
Prior to discharge we were given instruction to the changes made but did not have to reaffirm the oath. Active duty completed after Cuban Crisis, extension.