U.S. Army paratroopers must be capable of deploying worldwide within 18 hours of receiving orders. They act as a strategic crisis response force by executing forcible-entry parachute assault to secure objectives for larger follow-on forces. To meet these objectives the Army utilizes Basic, Senior and Master parachutists within its airborne units.

Football coaches once believed that speed was a natural attribute that couldn't be improved with training, hence the adage "you can't coach speed." But coaches and trainers now focus on both acceleration and top-line speed. And agility drills have remained a priority for the multi-directional running required in football.