U.S. Army Lt. Gen. Sean MacFarland, U.S. Army Training and Doctrine Command deputy commanding general and chief of staff, discusses doctrine updates during the 35th annual Association of the United States Army Colonial Professional Forum at the College of William and Mary in Williamsburg, Va., June 15, 2017. During the forum, held June 14-15, TRADOC leaders discussed a variety of topics related to Multi-Domain Battle and the future force. (U.S. Army photo/Amy Robinson)