Great info above - my main recommendation here would be to ensure you have a 4 year plan to graduate/ commission that includes a semester abroad that is expressly approved by both your academic advisor and military academic advisory/ chain of command.
Confirm payment paths (third party v university) and how scholarships are processed with those if applicable. Semesters abroad come with so many added costs often: Flights to/from, meals for 3.5 months not covered with a pure room charge, higher tuition, a EU cell plan, and the about 20 cool excursions in city and nearby countries, cities that are ala carte, maybe one parent long weekend visit, museum fees, etc. In my experience too knowing where to buy food like a local v tourist is a gamechanger - also knowing which intra-country flights are cheap and when is amazing. London to Madrid - literally 19.00 /RT on the right weekend, 400 euro R/T on peak. Eurrail pass optoins... I went to Italy, Switzerland, France, Monaco for less money than a buddy who traveled to Paris alone for half the duration but didn't plan, ate better food, etc. Granted his sheet thread counts were exponentially higher, his bathrooms more private... research hostels, student discounts,, and "cheap seats" to events like football games Research scholarship opportunities from your university. Information and planning can be so powerful.