Dressed warmly, an unnamed NACA test pilot in 1928 gets ready for a high-altitudeflight from the group's Langley Memorial Aeronautical Laboratory airfield in Virginia.
The flight test was conducted in the challenging highaltitude environment required for refueling of high altitude long endurance (HALE) unmanned aircraft systems (UAS).
It's the basic physics that the air is thinner and the resistance to any projectile is less so the flight path of the ball will be different at highaltitude.