From Wikipedia

General Ann E. Dunwoody, USA (born 1953), is the current Commanding General, U.S. Army Materiel Command. She previously served as Deputy Commanding General, U.S. Army Materiel Command from June 17, 2008 to November 13, 2008. On June 23, 2008, U.S. President George W. Bush nominated her to serve as the next Commander, U.S. Army Materiel Command. She was confirmed by the Senate on July 23, 2008.[1] She is the first woman in the U.S. military to hold the rank of a four-star general, receiving her fourth star on 14 November 2008. [2]

By law, women are excluded from combat jobs, the typical path to four-star rank in the military. However, in 2005, Dunwoody became the Army's top-ranking female when she received the promotion to lieutenant general (three stars) and became the Army's Deputy Chief of Staff, G-4 (logistics).

http://en.wikipedia.org/wiki/Ann_E._Dunwoody

General Ann E Dunwoody made it to four star General while all the while being excluded by law from combat jobs, a remarkable achievement.