Portal:Ohio/On this day.../April 28
(1919) Leslie Irvin tested the first military free-fall parachute when he jumped from a de Havilland DH-9 biplane flying at 100 mph while {{convert|1,500|ft|m}} over McCook Field in Dayton, Ohio.
(1919) Leslie Irvin tested the first military free-fall parachute when he jumped from a de Havilland DH-9 biplane flying at 100 mph while {{convert|1,500|ft|m}} over McCook Field in Dayton, Ohio.