In a lot of the shows, German soldiers are seen wearing large field packs [back packs], even if they are guarding something. Soldiers from all armies are trained to drop their packs before going into action for better maneuverability.
"The show lasted longer than the war in Europe by Four years. From D Day to end 11 months. The show 5 years."
The war in Europe did not start on D-Day. It started in 1939. The US involvement started after Japan attacked Pearl Harbor in 1941. Right after that, the US declared war on Japan and Germany declared war on the US.