sentences:  Gary L. Littrell
  
  Gary Lee Littrell (born October 26, 1944) is a retired United States Army command sergeant major who, while serving as an adviser to Army of the Republic of Vietnam's Ranger units during the Vietnam War, acted with extraordinary courage during a four-day siege on his battalion, for which he was awarded the Medal of Honor.Between April 4 and April 8, 1970, while serving on Advisory Team 21 of I Corps Advisory Group, in Kontum Province, Republic of Vietnam, Sergeant First Class Littrell was a Light Weapons Infantry Advisor with the 23rd Battalion, 2nd Ranger Group.