Jadler and 1985 are right on point; your BGO will have only skeletal info on you at best. If you'd like to make some points I'd suggest you prepare a brief resume summarizing your academic, athletic, community service accomplishments, your sources of encouragement and inspiration re military service, and how you came to become interested in the service academies. This will help frame your interview and save your BGO a good bit of writing making it possible to focus more time on getting to discuss your progress and what you should be doing to complete your file.