Walt Kelly, the creator of POGO, set aside every November 11 for Veterans' Day. He was one of The Greatest Generation, but could not actually serve in the military during World War II due to health issues. However, he was not exactly a "hawk" about his respect for the military.
DC Comics, which was the popular culture institution that had the most effect on me growing up, did things right.
Marvel Comics, of course, had the best known veteran ever. Captain America sometimes was a bit too gung-ho for my tastes, but he was always good at heart. He is a favorite.
I think a simple, "Thank you" is appropriate. Although it is wholly insufficient, it is still more than any soldier I have ever met ever expected.
US Service Men and Women Out There:
Thank You For Your Service!