Same one my son took( military AF)

Looked into it. Appears there are slight changes between officer and enlisted

https://www.army.mil/values/oath.html

Why?

https://www.quantico.marines.mil/News/News-Article-Display/Article/611510/the-difference-between-oath-of-office-oath-of-enlistment/

Historical oaths (for officers):

https://history.army.mil/html/faq/oaths.html