Augustus Autumn Colonel Augustus Autumn ( born in 2222 ) is the commanding officer of the Enclave ' s Department of the Army in the Capital Wasteland in 2277 and the main antagonist of " Fallout 3 " . Background . Early life . Augustus was born and raised on the Enclave Oil Rig . His father , Autumn Senior , was a high - ranking scientist in the Enclave at the time of its destruction by the Chosen One in 2242 . He then received orders from the new President of the United States who succeeded Dick Richardson , a former presidential advisor named John Henry Eden , to take all surviving Enclave troops and relocate them to the Raven Rock military base on the East Coast . Autumn Senior obeyed that order , gathering his troops and their equipment as he led them eastwards through the wastelands of the post - nuclear United States . Upon the Enclave ' s arrival in the Capital Wasteland , he was the only one who knew that President Eden was actually a ZAX supercomputer unit that had achieved self - awareness . Prior to his death , Autumn Senior passed that knowledge on to his son , who would become the leader of the Enclave ' s military and eventually attain the rank of Colonel . Enclave Military Commander . Colonel Autumn has proven to be far less subservient than his scientist father , often openly disagreeing with the president ' s decisions . He did not trust Eden completely , fearing that some of the supercomputer ' s methods were too extreme , and kept the ZAX destruct sequence for the president in his room as a last resort . At some point , he ordered experimental testing on ED - E be carried out while the robot was fully functional , to the shock of Dr . Whitley . During the Enclave assault on Project Purity , Autumn confronted James and seemingly died after the scientist flooded the project ' s main chamber with deadly radiation to prevent the Enclave takeover . However , he managed to survive by injecting himself with a mysterious agent — likely a more effective equivalent of Rad - X or RadAway . Colonel Autumn is extremely ruthless and shows no regret over his actions , such as shooting unarmed captives or breaking promises of mercy , as long as it serves the Enclave ' s ends . He is a firm believer in the revival of the United States as a nation of power in the post - nuclear world , and will do almost anything in order to fulfill this vision . Disagreements . Following their capture and imprisonment in Raven Rock , Eden ordered the release of the Lone Wanderer so he could speak with them . Upon hearing of this , Autumn contradicted Eden ' s orders and ordered his men to kill the Wanderer instead . Autumn then departed for Jefferson Memorial , unaware of Eden ' s betrayal and attempted recruitment of the Lone Wanderer . When the Wanderer , Lyons ' Pride and Liberty Prime assaulted Project Purity , Autumn led the Enclave soldiers defending the facility and personally confronted the Lone Wanderer in the end . The Lone Wanderer could choose whether to inform Autumn of Eden ' s betrayal and convince him to give up , or simply kill him . If " Broken Steel " is installed , Elder Lyons can be heard asking " He / She just let him get away like that ? . . . " during the " 2 weeks later " transition . He is mentioned in " Lonesome Road " ; it is stated that he wanted all the assets used in the development of the duraframe eyebots to be redirected towards Enclave Hellfire armor . Whitley was not happy with this idea , so he sent ED - E away to Navarro . Appearances . Augustus Autumn appears in " Fallout 3 " and " Fallout Shelter " , and is mentioned in the " Fallout 3 " add - on " Broken Steel " and " " " Lonesome Road " .