Here's another way to look at it:
Slightly more than 1M people of the 300+ million people in the US have HIV/AIDS.
Gay men with HIV/AIDS account for nearly 532,000 of that 1M. That equals out to .17% of the total population.
There are 1,454,515 active duty military personnel (as of February 2009).
Per the 2000 census, there are 36,000 gay people (men and women) in the military. Per the Census, approximately 11,000 of those gay military people are women, reducing the potental pool of HIV/AIDS people to 25,000. If you apply the HIV numbers in general population to the military, that means that of 1,454,515 active duty military personnel, 42.5 of them have HIV/AIDS. That is assuming that only gay men will get HIV/AIDS, and that these 42.5 gay men managed to evade the almost continual medical monitoring of military personnel, which includes HIV testing.
So you would be afraid of getting HIV/AIDS because the bleeding soldier might be gay. A .0028% chance of getting infected by a gay soldier. (I am not too good with teh maths, so someone check my cipherin'...)
Hepatitis B is estimated to be 50 to 100 times more infectious than HIV. High-risk groups are injecting drug users, and people who have unprotected sex with multiple sex partners. Viral hepatitis is the leading cause of liver cancer and the most common reason for liver transplantation. In the United States, an estimated 1.2M people are living with chronic Hepatitis B and 3.2 M are living with chronic Hepatitis C. Sixty thousand new cases every year. Spreading faster than HIV/AIDS.
Based on those figures from the CDC,I would be MUCH more afraid of getting Hep B or C from the soldier who cut a swath through the whorehouses of Manilla or partied with the bar flies that swarm Ft Benning or Ft Rucker or Pax River or Norfolk or Paris Island.