The cop didn't even know who he was fighting in the war?
One strange thing I noticed (I see that it's also mentioned in the goofs section) when the police officer was confronting Donovan after the attack on his house - he says he fought on Omaha Beach against "these guys", against commies.
It's quite a simple history fact that USA was fighting Nazi Germany and Japan in WW2 while being in an alliance with the Soviet Union.
It just doesn't seem realistic to me that someone who actually fought in the war could forget who he was fighting against as that would be one of the most important events in his life.