Thank you for your years of service, it is much appreciated.
As far as the retirement side, my father spent 20+ years in the Army prior to retiring in '81, then another 20+ in the private sector. He finally retired for good 2 years ago. He seemed to adapt well, and really enjoy the civilian side. Although after retiring from both, he soon realized he need to change his phone plan to "Unlimited" calling.
Just watch out, there is such a thing for many as too much golf for some. I am now in a position where I play around 5 times a week. Although anything more than that, at least to me, borders on being more of a commitment and I tend to almost lose focus on my game. I have actually set it up so I intentionally play fewer rounds of 18 holes, and more of just 9 hole leagues and gatherings. Then maybe get out a little to practice on the side.