Call of Duty Black Ops Convoy ,able to damage cross?

I'm pretty sure the C4 always shows a hitmarker when it blows up. I dunno why, just how it is. If you go in the building behind the A flag on convoy there is alist on the wall of how many barrels and crates are on each map. If you go into the jail building (the one near the walking trail) and go inside there is a poster of a boy. Read his description and why he is wanted for a good laugh