Hibbs joined the Army from Des Moines, Iowa in August 1964, and by March 5, 1966 was serving as a second lieutenant in Company B, 2nd Battalion, 28th Infantry Regiment, 1st Infantry Division. He had earned his commission from the Reserve Officers Training Corps program at the University of Northern Iowa. On that day, at Don Dien Lo Ke in the Republic of Vietnam, his patrol spotted a Viet Congress force approaching the 2nd Battalion"s position.
Hibbs led his small group in an attack on the enemy force and, with another soldier, volunteered to rescue a wounded comrade.
After reaching the wounded man, Hibbs stayed behind to provide covering fire and was mortally wounded while attacking an enemy machine gun emplacement. Hibbs, aged 22 at his death, was buried in Greenwood Cemetery, Cedar Falls, Iowa.
2LT Hibbs was honored by having a section of the University campus renamed in his honor, and a flagpole and monument erected with his name on it, just east of the West Gym.