What is a B-1 Stamp?

My DH was an officer in the United States Air Force for twenty years. For most of his USAF career, he flew as a Weapons Systems Officer in the back seat of a B-1 Bomber, affectionately referred to as the Bone. (B-1 spelled out is B-one, or Bone.) I bought a B-1 stamp years ago. It's his favorite stamp, and he threatened to make my Mother's Day card with it. Hence my surprise at the lack of a B-1 on the card he made.

Here's a card I made for him with it...and a warning. This card is a little naughty. If you are easily offended by married people being a little naughty, don't scroll down.

I bet everyone scrolls down. I would.