 In his final assignment, he served as the seventh commander of U.S. Special Operations Command (USSOCOM), from September 2, 2003, until July 9, 2007.As USSOCOM's commander, he was responsible for all unified special operations forces (SOF), both active duty and reserve.Brown joined the United States Army in 1967 as a private in the infantry and after graduating from Special Forces Qualification Course, he became a Green Beret.