Eugene Sierras was born in Tucson, Arizona. He attended local schools and graduated from the Univerity of Arizona in 1964. After graduation, he was immediately called to active duty in the United States Naval Reserve. He received his commission from the Naval Officer Candidate School in Newport, Rhode Island. After completing the Damage Control Assistant Course and Nuclear and Chemical and Biological Warfare School in Philadelphia Pennsylvania he was assigned to the USS Rockville where he served until receiving orders to the Basic Naval Aviation Observer's School in Pensacola, Florida via Pre Flight Training. He received his Navy Flight Officer Wings in 1967 and after completing Ready Replacement Training in San Diego, California he was assigned to fighter squadrons aboard aircraft carriers and deployed both to Southeast Asia and the Mediterranean theaters. After an assignment to the Aviation Training Command, he served a tour as Communications Officer aboard the USS Lexington. He completed his Navy career after completing staff officer and executive officer assignments.
Eugene returned to Tucson, Arizona and completed a career with the Arizona Department of Public Safety.
He currently resides in Tucson, Arizona.