Though the mission-jump takes place from 40,000ft, the maximum service ceiling of the Hercules C-130 that is being jumped from is 30,000ft.
At 24:08, Tiffy tells Wilson "in basic training the Army teaches every soldier how to shoot a man-sized target from 1000 yards." Would that this were so--this is a distance at which trained snipers might shoot, but not "every soldier." Regular infantry awarded the Sharpshooter designation are trained to hit targets at 200 meters, and those with the Expert designation at distances of up to 300 meters.