I found this patch online maybe five years ago, ordered ten of them, re-sold six or seven to other drivers, and sewed the rest onto jackets and hats. A fair number of drivers are Nam era vets, even though I was the only real door gunner. One of my pals was a Cobra pilot, so he took two.
“Short Bus Door Gunner”
Needless to say, the “short bus” meme abounds in many forms.