PSYOPs isn’t a basic branch you can commission straight into in the Army. You’ll typically spend a couple years after commissioning in whatever basic branch you are assigned and apply to assess near the end of your first duty assignment. Pending a positive assessment and a normal timeline, you’ll then attend the SOF CCC and your follow on training to serve as a PSYOPs officer operationally as a junior captain.
So yes, USMA officers can go PSYOPs but just like any other commissioning source or ARSOF community, it’ll be down the road when you are eligible to apply.
You can check out the application process here:
PSYOPs Recruiting