Colonel George Mack Riddle, USAF, Ret., of Fairfield, Calif., passed away on Wednesday July 5, 2023, after a battle with cancer. He had a long and distinguished career as a civil engineer in the United States Air Force (26 years) and thereafter in private industry on a number of major construction projects. He also lovingly headed, along with his wife of 65 years Rachel Riddle (Crosby), an extended family including four children, twelve grandchildren and two great grandchildren, all of whom loved him very much.Mack was born to William Wilson Riddle and Mary Ida Riddle (Flanagan) in Gastonia, North Carolina on June 15, 1936, as the youngest of eight children. He attended Clover High School in Clover SC, where he was valedictorian. He received a Bachelor of Science Degree in Civil Engineering from The Citadel in 1958, where he was a Distinguished Military Graduate. While attending the Citadel he also met his wife Rachel Crosby, and they married on June 1, 1958. Mack thereafter attended Oklahoma State University, where he earned a Master of Science degree in Civil Engineering in 1959. In 1975, he was awarded a Doctor of Philosophy Degree from Oklahoma State University, again in Civil Engineering with an emphasis on structures. Colonel Riddle entered the Air Force in September 1959, having earned his commission through the ROTC program at The Citadel. He served in the Air Force on a variety of major engineering and construction projects until retiring in September 1985 after serving as Director of the Engineering Division of the AFRCE at Norton Air Force Base (San Bernardino, CA) supporting multi-billion dollar ballistic missile construction projects. After retiring from the military, he served as Project Manager/Program Director for ICF Kaiser Engineer’s projects for both infrastructure and technology projects, including overall management of the conventional facilities portion of the Superconducting Super Collider (SSC) project for the Department of Energy as well as several other major transportation projects in Oklahoma, Florida, Illinois, and Hawaii.Mack is survived by his wife Rachel of Fairfield CA, as well as his children Mack, Jr. (Patricia Neesen) of Moraga CA, Philip Craig (Debbie Stokes) of Fairfield CA, William (Debbie Klaproth) of Sacramento CA and daughter in law Joan Riddle. He was preceded in death by his son David Riddle of Redlands, CA. He also is survived by twelve grandchildren (Travis, Kyle, Kimberly, Jessica, David Jr., Ryan, Lauren, Megan, Rachel, Nick, Nadine and Nora) and two great grandchildren (Ezra and Maya), as well as two of his sisters, Dorothy and Francis. His siblings Mary, Miriam, Catherine, Elsie and William predeceased him. He is fondly remembered by his extended family, all of whom will miss him greatly.Family and friends are invited to attend his burial service at Sacramento Valley National Cemetery at 5810 Midway Road in Dixon, California on Monday, July 10, 2023, at 11:30am. Burial arrangements by Oak Park Hills Chapel, Walnut Creek, CA. A Celebration of Life for Mack will be held later at a date, time, and location to be determined. In lieu of flowers, the family has requested that remembrances be made in the form of contributions to the Wounded Warrior Project or Lutheran Social Services of Northern California. Please express condolences at www.oakparkhillschapel.com.