Originally published in 1996, Guerrilla Air Defense remains the only book which looks at the topic of improvised and insurgent air defense weapons and techniques. The rise of airpower in the 20th century proved its worth in counterinsurgency operations and in turn has seen guerrilla and partisan movements develop the means to defeat the aircraft of the enemy. As Doc Crabtree explains, the roots of air defense actually goes back before 1900. Remarkably, a copy of this book was found in bin Laden's compound when he was killed by Navy Seals in 2011.