Karl Feuerriegel was born on November 1, 1916, in Phoenix, Arizona. He enlisted in the U.S. Army Air Forces Reserve on August 24, 1942, and entered the Aviation Cadet Program on February 14, 1943. Feuerriegel was commissioned a 2d Lt and awarded his pilot wings on December 4, 1943, and then served as an instructor pilot until May 1944. Lt Feuerriegel next transitioned into the B-24 Liberator and then served with the 741st Bomb Squadron of the 455th Bomb Group in the Mediterranean Theater of Operations from September 1944 to March 1945. Lt Feuerriegel left active duty and entered the Air Force Reserve on December 3, 1945, and joined the Arizona Air National Guard on July 28, 1947. He was activated on February 1, 1951, and served with the 197th Fighter Squadron at Luke AFB, Arizona, from February to March 1951, and then with the 127th Field Service Squadron at Luke from March 1951 to April 1952. Capt Feuerriegel served as a flight instructor with the 3526th Pilot Training Squadron at Williams AFB, Arizona, from April 1952 to February 1955, and then served with the 81st Fighter Bomber Squadron at Hahn AB, West Germany, and then at Toul-Rosieres AB, France, from March 1955 to April 1958. His next assignment was to the 462nd Tactical Fighter Squadron at Tinker AFB, Oklahoma, from April to November 1958, followed by service with the 4511th and 4512th Combat Crew Training Squadron at Luke AFB, Arizona, from November 1958 to July 1962. He served with the 45th Tactical Fighter Squadron at MacDill AFB, Florida, from July 1962 to January 1963, and then with the U.S. Military Supply Mission to India from January 1963 to January 1964. Col Feuerriegel served at Headquarters U.S. Air Force in the Pentagon from January 1964 to September 1967. He then became Operations Officer and then Commander of the 21st Tactical Air Support Squadron at Nha Trang AB in the Republic of Vietnam from October 1967 to October 1968. Col Feuerriegel's final assignment was at Bergstrom AFB, Texas, where he retired from the Air Force on March 31, 1974. Karl Feuerriegel died on March 4, 2008, and was buried at the Prescott National Cemetery in Prescott, Arizona.

His Air Force Cross Citation reads:

The President of the United States takes pleasure in presenting the Air Force Cross to Karl T. Feuerriegel, Lieutenant Colonel, U.S. Air Force, for extraordinary heroism in military operations against an opposing armed force as a Forward Air Controller of the 21st Tactical Air Support Squadron, Nha Trang Air Base, Vietnam, SEVENTH Air Force, in action at Nha Trang, Republic of Vietnam, on 30 January 1968. On that date, in conjunction with the Tet Offensive, a large, well-equipped hostile force entered the city, intent on overrunning military installations and releasing a large contingent of hostile captives from the local prison. The hostiles' entrenched positions prevented reinforcements from reaching the battle areas where friendly forces were in dire need of support. Lieutenant Colonel Feuerriegel, despite great personal risk from heavy automatic weapons fire, repeatedly attacked hostile positions in an O-2 aircraft armed with high explosive rockets. He systematically silenced three machine gun positions and neutralized two fortified hostile companies, thereby preventing the annihilation of beleaguered friendly units. Through his extraordinary heroism, superb airmanship, and aggressiveness, Lieutenant Colonel Feuerriegel reflected the highest credit upon himself and the United States Air Force.