Ask the school. Per the IRS a full time student is "as defined by the institution".
For tax purposes, you are not a student at all. You are in the Army.
Your parents can no longer claim you, with the possible exception of your first year, when you were probably still a HS student for the first half of the year and if you lived with them for more than half the year
Hal-Al - not all those attending places like West Point are actually considered to be "in" the military. It's possible their service does not start until after they graduate.
IF you are at West Point (implied by your post) You should use the Tax Drop-off service. You don' have time to do it yourself.....and there are all sorts of special situations that they know how to handle.
1) Here are the drop-off forms, but you can probably also get them locally:
https://s3.amazonaws.com/usma-media/inline-images/Parents/pdf/tax_information_for_cadets.pdf
______________________
2) IF you insist on doing them yourself, you should read this first..it's primarily for Parents...but the information in them may apply to you also, no matter what year you are. The Tax Memo is from the USMA JAG:
https://s3.amazonaws.com/usma-media/inline-images/Parents/pdf/tax_information_for_parents.pdf