The Air Force should screen people better

If they were that clever they wouldn't be flat earthers.

how'd a flat earther pass the entrance exam to the air force?

Does a hot air balloon go high enough to see the curvature of the Earth?
Also, don't be too hard on this guy, he realized his mistake.

Minimum distance to see curvature of earth: 35k feet
Hot air balloons go: maximum of 69k feet