Many White House chiefs of staff are former politicians, and continue their political careers after their stint in the White House. Lyndon Johnson's chief of staff W. Marvin Watson became the Postmaster General later in the term. Richard Nixon's chief of staff Alexander Haig, a U.S. Army officer with his capstone military position being CINCUSEUCOM/SACEUR, later became Secretary of State under Ronald Reagan. Cheney later became a congressman for Wyoming, Secretary of Defense under George H. W. Bush and vice president in the George W. Bush administration. Donald Rumsfeld was another chief of staff for Ford and subsequently served as secretary of defense both in the Ford administration and decades later in the George W. Bush administration. Rahm Emanuel left a senior leadership position in the House of Representatives to become Barack Obama's first chief of staff and subsequently became Mayor of Chicago. Jack Lew, President Obama's fourth chief of staff, was later appointed secretary of the treasury.