Couple of months ago I was in donut place (Tim Hortons). Having a little meal with the wife, I bring her to the high-end places. I saw a soldier come in, I had like 4-5 bucks on me. I went to see what he was ordering, just a couple a coffees. I put 4$ down, gave him a tap on the shoulder and said "Thank you for all you do" and left.
My wife was proud of me. When the soldier got to his car, he made sure to salute me.
I have to admit, I always wanted to do something like that. I hope i'll be able to do it again. (srs)