Clay Harmsworth, 92 years old, passed away on 13 May 2022. He was born in Greeley, Colorado and graduated from the University of Idaho in 1953 with a B.S. (Mining Engineering). Clay and his wife, Doris, had a daughter Sharon and a son Alan. They also had a granddaughter and a grandson from their son Alan and his wife Tina. Career: 1953 - Quality Control Metallurgist, US Steel Corp. 1953-1959 - Materials Engineer, Metals and Ceramics Div, Air Force Materials Lab 1959-1960 - Project Engineer, Structures Branch, Air Force Flight Dynamics Lab 1960-1971 - Technical Manager for Engineering and Design Data, Materials Engineering Branch, Materials Support Div, Air Force Materials Lab. 1971 – Retirement - Systems Support Division, Air Force Materials Lab. Clay Harmsworth was internationally recognized as the Air Force's number one lead for determination of structural allowables used by industry for design of all DOD military aircraft. These allowables were used to reduce risks and promote efficient and safe design for flight loads unique to the demands of fighter, transports and cargo planes. Design allowables included mechanical properties for static and dynamic loading with reliability up to 99%. Military Handbook 5 was known as the "Bible" for both military and commercial applications of multiple metallic materials. The Engineering and Design Data laboratory managed by Clay performed testing under conditions relevant to air vehicles and operational environments, including room and elevated temperatures, high humidity, and creep rupture degradation over long periods of time under sustained load. The tests performed often corroborated properties reported by industry. His team was known as "honest brokers" among the many SPO's and Air Logistics Centers. In the 1970’s, Clay Harmsworth’s group in ML developed specimens for validating aircraft companies' inspection capabilities. 1000 specimens were made for aluminum, steel and titanium for the B-1 program. These specimens were subsequently used in implementation of Damage Tolerance Assessment on every active AF Aircraft.