During the Lam Son 719 Operation into Low Laos from January 30 to March 24, 1971, Major General Hieu was 5th Infantry Division Commander. He later joined the I Corps as I Corps Deputy Commander in June 1971.
1971 Lieutenant Colonel Le Quy Ky, Group I Transport Commander, who had participated in the Lam Son 719 - Route 9 Low Laos Operation was awarded a Corps citation and a Gold Star Medal of Valor by Major General Nguyen Van Hieu.