Army 1st Lt. Matthew Greene, left, reaches out for his mother, retired Col. Susan Myers, as she places a rose on the casket of her husband, Army Maj. Gen. Harold Greene, during his burial service at Arlington National Cemetery on Thursday.

Greene was killed Aug. 5 when a gunman dressed as an Afghan soldier turned on a NATO delegation at a military facility near Kabul.

He is the highest-ranking U.S. military officer to be killed in America’s post-9/11 wars.