Welcome to the forum. This forum will give you what you put into it. It’s a good tool where you can find support, meet people, and find information that can help you on your journey. Congratulations on your 12 days, and also in learning that one drink–no matter how socially it’s taken–is one too many.
Like you and @kat261, I have dealt with PTSD, though mine is not from public service but rather from trama, some of which stemming from my earliest memories. It is something I have worked with intensely over the years because you can only try to numb it out for so long, and God knows that none of the “medicine” I’ve been given for it has ever helped.
I hope you will keep this forum in your sobriety tool box. There is a daily check in thread that a lot of people find helpful.
I wish you the best in your journey.