Few people have ever heard of Frederick Zinn, yet even today airmen's families are touched by this man and the work he performed in both world wars. Zinn created the techniques still in use to determine the final fate of airmen missing in action. The last line of the Air Force Creed reads, ""We will leave no airman behind."" Zinn made that promise possible. Blaine Pardoe weaves together the complex story of a man who brought peace and closure to countless families who lost airmen during both world wars. His lasting contribution to warfare was a combination of his methodology for locating the remains of missing pilots (known as the Zinn system) and his innovation of imprinting all aircraft parts with the same serial number so that if a wreck was located, the crewman could be identified. The tradition he established for seeking and recovering airmen is carried on to this day.|Few people have ever heard of Frederick Zinn, yet even today airmen's families are touched by this man and the work he performed in both world wars. Zinn created the techniques still in use to determine the final fate of airmen missing in action. The last line of the Air Force Creed reads, ""We will leave no airman behind."" Zinn made that promise possible. Blaine Pardoe weaves together the complex story of a man who brought peace and closure to countless families who lost airmen during both world wars. His lasting contribution to warfare was a combination of his methodology for locating the remains of missing pilots (known as the Zinn system) and his innovation of imprinting all aircraft parts with the same serial number so that if a wreck was located, the crewman could be identified. The tradition he established for seeking and recovering airmen is carried on to this day.