On 1 September 1944, Tibbets reported to Colorado Springs Army Airfield, the headquarters of the Second Air Force, where he met with its commander, Major General Uzal Ent, and three representatives of the Manhattan Project, Lieutenant Colonel John Lansdale Jr., Captain William S. Parsons, and Norman F. Ramsey Jr., who briefed him on the project. Tibbets was told that he would be in charge of the 509th Composite Group, a fully self-contained organization of about 1,800 men, which would have 15 B-29s and a high priority for all kinds of military stores. Ent gave Tibbets a choice of three possible bases: Great Bend Army Airfield, Kansas; Mountain Home Army Airfield, Idaho; or Wendover Army Air Field, Utah. Tibbets selected Wendover for its remoteness.