He taught himself to be a pilot. During World War II, he designed a machine used to train military aircraft crews to fire guns at enemy aircraft.
VOA: special.2009.01.14
When war broke out in 1939, Freeborn temporarily gave up his fledgling career to train as a fighter pilot, only to almost lose his life to Asian flu and haemophilia.
For the 2012 observance of National HIV Testing Day, June 27, the Centers for Disease Control and Prevention has announced a new pilot project to train pharmacists and retail store clinic staff at 12 rural and 12 urban sites to provide voluntary, confidential, rapid HIV testing.