Abwehr—German military intelligence agency that operated before and during WWII—until early 1944, when Hitler turned all Secret Service activities over to the SS
Feldwebel—Noncommissioned officer in the German Army; rank similar to a sergeant in the US Army
G-2—Intelligence staff in the US Army
Gefreiter—Soldier in the German Army; rank similar to a private in the US Army
Hauptmann—Officer in the German Army; rank similar to a captain in the US Army
Hauptsturmführer—Officer in the Gestapo; rank similar to a captain in the US Army
Milice—French police. Their main task was to find and arrest the French Resistance. They generally cooperated with the Gestapo
Oberleutnant—Officer in the German Army; rank similar to a first lieutenant in the US Army
Oberst—Officer in the German Army; rank similar to a colonel in the US Army
Obersturmführer—Officer in the Gestapo; rank similar to a first lieutenant in the US Army
OSS—Office of Strategic Services. US intelligence and sabotage agency that operated from June 1942–January 1946
RAF—Royal Air Force (British)
SHAEF—Supreme Headquarters, Allied Expeditionary Force. Headed by General Eisenhower, this group planned the Normandy invasion
SOE—Special Operations Executive. British intelligence and sabotage agency that operated from July 1940–January 1946
Standartenführer—Officer in the Gestapo; rank similar to a colonel in the US Army
Sturmmann—Stormtrooper in the Gestapo