The Quartermaster General of the United States Army is a general officer who is responsible for the Quartermaster Corps, the Quartermaster branch of the U.S. Army. The Quartermaster General does not command Quartermaster units, but is primarily focused on training, doctrine and professional development of Quartermaster soldiers. The Quartermaster General also serves as the Commanding General, U.S. Army Quartermaster Center and School, Fort Lee, Virginia and the traditional Quartermaster Corps. The office of the Quartermaster General was established by resolution of the Continental Congress on 16 June 1775, but the position was not filled until 14 August 1775. Perhaps the most famous Quartermaster General was Nathanael Greene, who was the third Quartermaster General, serving from March 1778 to August 1780. The first Quartermaster General to serve in the U.S. Army was Thomas Mifflin of Pennsylvania.