Executive Order Number 3066

Order #3066 was a military decree that was announced in 1908 by the Amestrian head of state, King Bradley in which any State Alchemists with combat suited abilities would be sent into the front lines of the Ishval Civil War to act as human weapons. This decision resulted in the war coming to a close.

Trivia

 * It is possible that the number is based on the famous "Order 66" from Star Wars lore.