Pat Dugan was Stripesy, a costumed hero who fought in World War II. If that backstory will remain for this 2018 TV Show is unknown. The following is based on the known lore from the comics and could change as the show develops:
Patrick "Pat" Dugan became the costumed hero Stripesy after aiding a young Sylvester Pemberton III against Nazi spies posing as protestors at a movie on 4 July 1941. The two team as embodiments of the American flag, Star-Spangled Kid and Stripesy, in order to track down and stop the spies.