I was able to get a couple of good Call of Duty: WWII Headquarters Screenshots and this is what I am able to tell based on the images. As you can can see in the below image, the soldiers in the field below looks like they are in the Normandy beach and this is what the headquarters will be located.
The other details are in the different soldiers that are on the beach, all of them have a number to them but not all are level 55 as we see it in the 2 soldiers below. Looking at the two characters in the images below I can tell that they have reach level 55 and also have 5 stars next to each meaning that they may have level up in the multiplayer. This has not yet been confirmed but is my wild guess. What do you think?
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Another detail to see is all the big ships full of cargo, they either bring weapons, food, soldiers, vehicles to sustain the troops in World war 2. Hope this images do help you and let me know in the comment below what else do you see in the screenshots?