It's a bit strange.
The guy with the MP 40 is a mirrored representation of a picture from Normandy dated 21st of June 1944, whilst the guy with the MG 34 (also Strela's avatar) is in a picture from Italy dated September 1943.
http://commons.wikimedia.org/wiki/File:B...mit_MP.jpg
http://commons.wikimedia.org/wiki/File:B...schaft.jpg
Edit:
It gets stranger, as the third guy is in a picture from Russia dated 1943.
http://commons.wikimedia.org/wiki/File:B...anaten.jpg
I have a feeling the next teaser/anticipation topic will make my head spin just as much as the one for Kursk, where I couldn't match the screenshot of the scenario with a map in any of my books due to the maps being less accurate.