Kedenburg joined the Army from his birthplace of Brooklyn, New York in 1965, and by June 13, 1968, was serving as a Specialist Five in the 5th Special Forces Group (Airborne), 1st Special Forces. During a fierce firefight on that day, in the Republic of Vietnam/Laos, Kedenburg voluntarily gave the last spot on an extraction helicopter to a South Vietnamese soldier. Ordering the full helicopter to leave, he then continued to engage the enemy alone until being overrun.
A road at Fort Bragg, North Carolina is named in his honor.
Kedenburg, aged 21 at his death, was buried in Long Island National Cemetery, Farmingdale, New New York