Cloud appears three times in the following posting:
Twenty Goofy Moments from DC and Marvel's Silver Age War Comics
In OUR FIGHTING FORCES #128, Cloud fights a grudge match with Sharp Claw, an Indian ace for the Nazis (!).
In OUR FIGHTING FORCES #125, the Nazis use an "Indian trick"--a tree snare--from an unspecified tribe.
In OUR ARMY AT WAR #177, Cloud's father fought a German ace he called the "black hawk of death" in World War I. Incredibly, Cloud meets the same German in World War II.
So three of the 20 goofy moments involve Johnny Cloud. Which probably shouldn't be too surprising. Natives served in WW II in great numbers, but I'm not sure any of them were flying aces. The whole concept seems a goofy contrivance.
And I doubt any comic-book writers in the 1960s had more than a superficial knowledge of Indians. We should be grateful that Cloud was a relatively unstereotypical and three-dimensional character. He could've been a lot goofier.
For more on the subject, see Comic Books Featuring Indians.