If you have contemplated applying to a service academy such as West Point or Annapolis, or if you are applying to one of them, you might want to also consider applying for an ROTC scholarship at one of the more than 1100 colleges that are part of the ROTC program.
The Reserved Officer Training Corp (ROTC) originated with the National Defense Act of 1916. Each branch has its own unique requirements, service obligations, and availability. If you wish to get a better sense of the workings of the various programs, take a look at the ‘Guide to Understanding ROTC Programs here.