I spent 4 years in recruitment, the best reference letters come from individuals who are in a position of authority; the higher they are educated the better. The last thing you need is a poorly written reference letter. The letter writer should give several examples why they feel you are best suited for a military career. E.g. competed several years in organized sports; leadership role in organized sports, army cadets, scouts; and, work history. Even a simple job delivering newspapers as a kid is important because it shows you have experience in time management and accountability. You also don't have to be a jock; equipment manager is just as important because it shows you are a team player. The important thing to remember you are competing with other individuals for a job, what you don’t want as a letter stating that they have known you for many years and you’re a really good kid.