My $0.02;
My letters came from;
1. Last man to walk on the moon; Navy Captain Ret.
2. A second Apollo astronaut; AF Lt. General Ret.
3. A Rear Admiral in the reserves that I've known for 15 years
4. An active LCDR flight instructor at a near by AFB
5. My boss; whom I have worked for for 1.5 years.
Letters 1,2&3 were on personal letterhead. Letter 4 was on a military form. Letter 5 was on a form sent from my recruiter. That being said, I also have my pilots license, did very well on the ASTB and still didn't get my first choice selection. I was awarded the opportunity to join OCS class 15 Nov 2003 with my second choice and I'll be there. Bottom line in my opinion, do what the recruiter says is best for your package and go with it and don't look back.
Do your best, hope for the best, expect the worst, let the cards fall how the will and deal with them accordingly.
See ya in November