• Outstanding Book Award, Army Historical Foundation for Thunder and Flames, 2015
  • Master Corporal Jan Stanislaw Jakobczak Memorial Book Award, U.S. Military History Group for Thunder and Flames, 2015
  • George Washington Masonic Memorial Award, for scholarship on George Washington, 2014.
  • Norman B. Tomlinson, Jr., book prize for To Conquer Hell: The Meuse-Argonne, 1918; The Western Front Association, 2008.
  • National Humanities Medal (co-recipient, with Washington Papers Project), 2005