The All Star Squadron was created by Roy Thomas and Rich Buckler.
The premise was that anybody who was a hero during The Golden Age could be a member of this team that was pulled together by FDR to combat the NAZI threat.
It also showed that the group was mortal because original members of the team died. Many members of which return in later versions of the teams.
The link below gives a better synopsis of the story.
Also note that a 2 versions of Firebrand appeared in the series as well.
It is a great read and I highly recommend it to all.
https://comicvine.gamespot.com/all-star-squadron-32-crisis-on-earth-x-the-prequel/4000-24147/
Here is a cover gallery from their appearances.
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