Carry on; I will be in the area all afternoon.
In my first and last quasi-airline job in the States I was a First Officer on a Twin Otter for Atlantis Airlines (they later sank without a trace), based at Myrtle Beach, South Carolina. This was a dual-use airport/air base.
The Company had kitted us out in Navy-style uniforms, double-breasted jackets with brass buttons and white caps. No ribbons, unfortunately, but a cheesy set of gold wings to complete the effect.
One day I was walking in the terminal past a young Airman when a flicker of motion caught my eye. My Captain then told me, 'He just saluted you!'
So I turned around and waved. Well, I certainly wasn't going to salute him in return but it would have been rude to ignore him.