First World War
First World war.com: Encyclopedia Observation Balloons
Describes how observation balloons were used during World War I, the dangers of piloting one, and difficulties the enemy faced in trying to bring one down.
Other
Hill Air Force Base: Fact Sheets: William "Billy" Mitchell
Read a brief account of the foresight of Brig. Gen. William "Billy" Mitchell (1879-1936), who understood early on that airplanes would play a huge role as a weapon in fighting wars. He is considered the father of the modern air force,...