This issue introduces Mac the second G.I. Robot. It is stated in story that a member of the Suicide Squad went on a mission with the first Mac, but both went missing in action. The first G.I. Robot appeared in issues #101-103, however in those stories the robot was called Joe and the human was named Mac. It is unknown if the Squad member that went MIA with G.I. Robot #1 is the same person as Mac the human.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. Schwartz kept editorial records for Robert Kanigher, who edited this issue.