"Commanding The Dumb" joke

As we stood in formation at the Pensacola Naval Air Station, our Flight Instructor said, “All right! All you dummies fall out. ”
As the rest of the squad wandered away, I remained at attention.
The instructor walked over until he was eye-to-eye with me, and then just raised a single eyebrow. I smiled and said, “Sure was a lot of ‘em, huh sir? ”