The last, and the shortest, of the new series to debut in Star-Spangled Comics 1 was Armstrong of the Army. As one might guess, it deals with the military, Armstrong being a lieutenant with US Army Intelligence.
His first story displays a lot more action than scheming, as he comes to the aid of some pilots, shot down by spies, who are out to steal secret government documents .
Facts about Armstrong and his life are few and far between. He mentions graduating from West Point, but that is about the only thing we learn about him. We never even find out what his first name is. There is no supporting cast, and no real recurring villains.
The stories stay fairly close to reality, as Armstrong faces off against Nazi agents in every one of his tale. He protects an American inventor who has created a time ray, which causes things to age and decay, in issue 2, and unmasks a phony officer in Star-Spangled 3.
Armstrong faces some nastier opponents as well. In issue 4 he becomes the captive of a German agent who throws people to his sharks. It's Armstrong's great fortune that the deadly animals had just been fed.
After a sea-based adventure with a Nazi sub in issue 5, Armstrong's final story sees him attacked by a jaguar, which has been trained to understand commands in German.
And though Armstrong appears to be fine at the end of the story, having been rescued just in time, the art avoids showing him too much after the jaguar attack. The character never appeared again. So I think it's fairly safe to say he got mauled more severely than the tale implies, and that was it for Armstrong.
Armstrong of the Army: Star-Spangled Comics 1 - 6 (Oct 41 - March 42)