Have just watched this trailer http://www.apple.com/trailers/sony/whywefight/trailer/ Now it's about the american military industrial complex however a little after half way in you can see a british soldier in a sandy place provided protection for troops loading onto a helicopter. However he has a cover on the end of his barrel. Could someone tell me why? (SOP for certain training exercise, bad drills... etc?) Sparked a level of curiosity in an otherwise dull trailer.