 On October 22, 2010, in a ceremony at Marine Barracks, Washington, D.C., Amos assumed the position as Commandant.This marked the first time a Marine aviator had held the position of Commandant, and the first time since 1983 that a sitting Assistant Commandant had moved up to become Commandant.During his tenure as Commandant, Amos completed the Corps' combat mission in Afghanistan.