ROSENGARTEN, Nathan Robert "Rosie" Age 101 of Centerville, formerly of Bellbrook, passed away peacefully on Wednesday, March 15, 2017 at his home at Otterbien Senior Campus, Centerville, Ohio. Nathan was born September 2, 1915 in Philadelphia, PA, son of Fannie (Schnideman) and Robert Nathan Rosengarten. Nate graduated from Camden High School (New Jersey) in 1934. He received an engineering degree from Drexel University in Philadelphia in 1939. While at Drexel he had a co-op (work and study) job with the Lycoming Manufacturing Company. It was here that he became interested in aircraft engines. After graduating from Drexel he went to work for the Pratt-Whitney Aircraft Company. He enlisted in the United States Army Air Corps (now known as United States Air Force) and served for 32 years, retiring in 1973 as a full Colonel. Colonel Rosengarten was instrumental in the development of jet engines for United States military aircraft. He was the first test engineer of jet propelled aircraft in the United States. Early in 1946 he received recognition for his work for the engineering associated with the execution of the first coast to coast jet speed record made by the P -80 Aircraft. In April and May of 1946 he served as project leader of test flights made in a captured German Messerschmidt ME-163B jet propelled fighter. A Lieutenant Colonel by 1951, he was in charge of Aircraft and Missiles at the Air Technical Intelligence Center in 1951. The center's responsibility included the investigation of UFO reports. He also was involved in investigating UFO sightings in 1951. In September of that year he took steps that led the to the initiation Project Blue Book, which would be the lead agency in UFO investigation for the next eighteen years. Colonel Rosengarten spent most of his career based in Ohio. He married on April 21, 1955, and with his wife Irma raised two sons, Robert Rosengarten and avid Rosengarten. They were members of Temple Beth Or and Beth Abraham Synagogue. Nathan is preceded in death by his wife of 52 years, Irma, parents Fannie and Robert Rosengarten, sisters Lillian (Ellis) Goodman, Laura Rosengarten and nephew Robert Rosen. He is survived by his sister Rosalie (Alvin) Rosen, two sons Robert (Cathy) Rosengarten and David (Rebecca) Rosengarten, four grandchildren; Amy (Greg) Shumway, Elise Rosengarten, Cade Rosengarten and Reghan Rosengarten, two great grandchildren Blake Robert Sutton and Gracie Marie Rosengarten, nephew Colman (Robin) Rosen and children, niece Jean (Robert deceased) Rosen and children. Nate was a proud American that dedicated his life to serving his country and taking care of his family. He was so loved and will be missed. The Rosengarten family would like to give special thanks to all of the amazing, kind, loving caregivers, nurses, nurses aides and rehab therapists that loved "Rosie" and helped him/us over the past few years. Private service.