Hello,
the concept is interesting but you have to make some creative decisions - is it ww2 or not? It's an important detail.
Then, find your true inciting event.
Since the movie begins when the man wakes up, this can't be the inciting event, this is the the initial situation, the set up. The first ten pages would be about a man waking up from coma with a peculiar amnesia, but then... what happens? What put the story in motion? That would be your true inciting incident.
Or you can start with the soldier in war, fighting hard and being touched by a bullet in the head. In this case the inciting event would be the waking up in amnesia.
Maybe the main character is a spy: this can suggest a 'scam' attitude, a world where things are rarely what they appears to be. He can wake up in a neutral territory, like Iran. In 1943 Theran was full of spys because of a very important conference. In this context an elaborate scam to get informations from a captured spy is perfectly believable. Or it's believable that a mentally ingjured spy can be extremely suspicious about everything around him.
Go write this movie!:)