The U.S. Air Force’s 509th Bomb Wing were originally based in Roswell, New Mexico, a fact that they use to great graphic effect in this unofficial patch that one of them had made:
Miss Fipi Lele sent me an alternate version, which throws in another reference to aliens by way of a science fiction short story that became one of the better Twilight Zone episodes:
Click to see the image at full size.
Wondering about the latin at the bottom of the patch, Gustatus similis pullus? It’s “dog latin” for “tastes like chicken”.