I'm often asked "are you in the army, or something?" No, but I frequently wear this hat in support of my friends who are, or have served! And I had to work for it - sort of!
A couple years ago I was at an air-show at Kennedy Space Center, and I'd forgotten to bring a hat. I asked at the US Army recruiting tent if I could have one, and a huge, muscular recruiter told me I'd have to do 50 push-ups to get it. A crowd, later estimated at between 2-3 people gathered to watch as I dropped down and did 50 solid boot-camp quality push ups. Except for the last 20 or so, which were iffy.
They say the cheer from the crowd that day could be heard from several feet away, as I called out "fifty" and Sgt. Beefmaster tossed me this cap. He rolled his eyes and went back to his business. As I walked away it ocurred to me that this was a man who had seen and done much, and was not impressed by some old guy doing push-ups.