The creator of The Flag is unknown but his first appearance was in Our Flag # 2 (October 1941) (Ace Comics). and he also appeared in Four Favourites and Our Favourites.
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The Flag
Disabled war veteran and flag-maker John Courtney ("Old Glory") finds a baby boy with a birthmark that resembled an American flag on his doorstep, on Flag Day. Believing there is something special about this child he names him Jim Courtney and raises him as his son. As Jim grow up he discovers from a dream that he has super speed and the strength of 100 men. Jim takes on the alias "The Flag" and uses his powers to help others.
Powers
References
The Flag (Ace Comics) Wikipedia(Text) CC BY-SA