Hello Paul,
Sorry that you're dealing with this disease. It is indeed devastating. As you know, hepatitis C is spread via re-use of needles, blood transfusions, sexual contact, or direct contact with other bodily fluids.
It is hard for me to imagine that injections that you would have received in the military would have been responsible for you contracting hepatitis C. Basically, this could ONLY have happened if they were reusing needles, or some component of the injection material that was coming in direct contact with one patient's bodily fluid (blood) and then being transferred to another patient. While we certainly hadn't identified hepatitis C thirty years ago, we were most certainly aware of the dangers of reusing anything that came in to direct contact with bodily fluids.
However, I suppose anything is possible. But before you decide that that is how you were infected, you'd really need to rule out other possibilities: ANY sexual partners that might have been untrue with you? EVER used someone else's needle for anything? EVER had a blood transfusion, or any other kind of blood product (plasma, platelets, cryoprecipitate) transfused into you? Ever had surgery of ANY sort?
The other thing is, if indeed that was the method you contracted the hepatitis (and again, I find it very hard to believe), others should have suffered the same fate, presumably.
I hope all of that helps. I know it's not a hard and fast answer, but what you're proposing seems unlikely to me. Hopefully you'll find the source, although I don't imagine it will much change the management of your disease now. Good luck.
