Douglas went on to Medical School in Alabama, where he also did his internship and residency in Urology. Practicing that specialty, he also remained in the Army Reserve, from which he retired in 1972. His last assignment was CO of the 3345th US Army Hospital with the rank of Colonel. Around 1990, he performed surgery on his former AC, now retired Major General Leo C. Lewis. Many past Crew 8 reunions were held at Douglas' home in Birmingham.