Disambiguation: of the Blackhawks
First published in: 1941
Olaf was the Swedish member of the Blackhawk Squadron. He first appeared in Military Comics (Quality Comics, 1941 Series) #2 (September 1941). Olaf may also have been one of the unidentified members of the Blackhawks that appeared in issue #1.
Olaf's surname, Bjornson, was revealed in Blackhawk (DC, 1957 series) #117 (October 1957).Link: https://en.wikipedia.org/wiki/Blackhawk_(DC_Comics)