Are you trying to write a period-correct Captain America story or just have questions about NYC in the 1930s-40s in general? The tumblr Steve Rogers Is Historically Accurate is here to help.
The Armed Forces of World War II, a flash presentation of rank insignia. The creator implies that it's a work in progress, but what I've clicked through seems pretty complete to me. Bonus Babylon 5 link on the left.
The Online Reference Guide to World War II German Helmets 1933-1945.
Almost sixty years after the end of the Second World War, the battlefields of Western Europe, Scandanavia, Russia and the Pacific continue to reveal poignant relics of the men who fought and died. These links may be of interest to anyone with even a passing interest in military history.
the grave of the unknown rapist. does the brutality of war result in man sinking to the depths of depravity