Question Mark Icon on Map?

[RichG]

Hi Guys

Was hoping somebody might be able to explain what the red question mark '?' icons are that appear on some of the maps in Battle for Normandy?  

I've not seen these in the Kursk game but they are on a few Normandy maps and even are present in some screenshots in the getting started guide, but there is no mention of their meaning or significance that I can find in any of the help files.

Thanks.