The Defense override module was a military device that could hack any nation's military drones and weapons systems, by breaking through their firewalls. Before Day 9, Adrian Cross designed the device with the intention of revealing the secrets of U.S. military to the world, thus rendering their weapons systems useless. However Derrick Yates, a British terrorist hacker and member of Cross's group Open Cell, had been hired by Margot Al-Harazi to create a device for hacking into the United States Air Force drones. Yates stole Cross's plans and modified them to create a drone override.