This would be why I said "almost". I elect to give broad overviews because if you are new to these things, it becomes muddled up really fast.
Start adding in types of scholarships, % given, what they cover and a new poster or lurker will be running for their bottle of tylenol because their head is spinning.
Every ROTC program has their pro's and con's, but one thing is constant when you accept that scholarship, YOU WILL BE SERVING IN THAT BRANCH. Remember you will be 26-27 when you get the chance to say Buh-by, and that is if you don't get your Masters on their dime or move after 3 yrs.
Don't accept or apply for a scholarship because it is free money. It may be free, but it comes with a big payback. If you hate boats, than you will be miserable for the 5 yrs after your life. If being in a tank or jumping out of perfectly good airplanes doesn't appeal to you, than the same may be true. If you want to fly helos and not fixed wing, the AF is not the best route. Not every branch is interchangeable.
There are careers that can easily overlap in every branch, Intel, Finance, Nurses, etc., but make sure you choose the branch that you want to serve in.
There are alot of hurdles the class of 15 will be going through, some will be deciding which branch, some will be deciding what to do in the military and some will be how to get a waiver for Dodmerb. Applying for a scholarship is a rollercoaster ride and it can be a lot of time sitting on your hands waiting for an answer. Yes, this early indicator is something to be excited about, you are a head of the game. The fact that you are researching this is even better, but just remember this is a marathon, not a sprint. The scholarship is only one aspect. For some that are very competitive, they may also turn down the ROTC scholarship because they get enough merit from the school. Our DS got the full ride, but at the same time he also got merit from other schools that were full ride, there are many on this board who have had to weigh the options out with their kids on the path that fits them the best.
Best of luck.