Powell then earned an MBA degree at George Washington University in Washington, DC. He received a White House fellowship and worked in the Office of Management and Budget during 1972–1973. As a lieutenant colonel Powell served as a battalion commander in the 2d Infantry Division. In 1975 Powell was promoted to full colonel and became a brigade commander in the 101st Airborne Division. He was promoted to the rank of general in 1989. He was appointed to the position of Chairman of the Joint Chiefs of Staff by President George H. W. Bush. He oversaw a number of crisis situations including Operation Desert Storm. In 1993 he retired from the military as a four-star general.