I don't have a spot. I still have to go to college. I'm just trying to figure out what I want to do.
Congratulations on your acceptance to GU and receiving the AROTC scholarship. That is certainly something to be proud of and it entitles you to nothing more than a free prestigious education and a commitment to military service thereafter, provided you don't do anything stupid.
You are wasting your time trying to plan for 15 years hence. The world will change. You will change. Most important you will begin to learn what you don't know as well as what you don't care to know.
Instead, I would recommend you be more of a sponge. At GU, particularly at the School of Foreign Service, you will cross paths with people who done or are doing all of the various things you dream of. You may find things that appeal to you as well as things that don't. You are obviously, doing some dreaming. That is a good thing. You will be in the perfect spot to discover in what direction you hope to go.
I was once in your shoes.
I headed off to George Washington University in 1974, hellbent on a foreign service career. My area of specialization was the Soviet Union and Eastern Europe. What could possibly be more exciting during the Cold War. I had professors who lived the experiences I read about. Classmates from the NSA, CIA, DOD. I studied Russian and German. Read Marx and Lenin. I met people in all sorts of careers. I was preparing for my own career and really enjoying everything I was studying.
At the end of the day, I discovered that I had no interest whatsoever in working for the government. I did not want to enter the insular world of the CIA or NSA. Besides, that work was boring. It was not Jason Bourne. Based on what I inferred from the Foreign Service Officers I met, the Foreign Service was just another job: writing cables, processing visa applications, escorting US dignitaries, etc. One's language or regional studies skillset meant nothing in one's postings. As Pima said, the Military is no better in that regard.
All prospects of such employment were later precluded by marrying a girl from a Soviet Bloc country, whose Father was a member of the Communist Party.
The ironic thing is that the Soviet Bloc was built on a house of cards and the USSR completely imploded. If the CIA saw it coming it was their best kept secret. Imagine spending years of your life analyzing Pravda and Izvestia and listening to Warsaw Pact tank drivers, only to see the whole enterprise collapse all by itself.
Now, 38 years later, that country is now in NATO and my Father-in-law couldn't be more proud of his grandson who is a 2Lt in the US Army deployed in the ME. You just never know what lies around the corner.
Best of luck! You got the Golden Ticket. Make the most of it.