First, thank you for your service to the USA. I can definitely relate to your story (although I started some 10 years later in life). At any rate, you're in the right place to take control of your addiction. We know you have the fortitude because of your previous service, so I fully believe that if you apply that to this quit, you will not and can not fail.
Don't worry about HOF. It is a significant milestone no doubt, but it is not the finish line. Worry only about today because today is the only day over which you can exert any control. This is difficult for type-A personalities, but if you try to rip off too big of a chunk, you may become overwhelmed and lose focus.
I'm quit with you today USMCDD. Keep up the good work, it's going to start paying some significant dividends in the very near future.