What Is This On My Hull????

Hopefully someone can help me out with this

I moded IW2 to include Aerospace Simulation Project models natively [I just imported the ships into the resource file with a lot of adjustments]. Everything works fine with the exception of this one model. It replaces the heavy corvette ingame and I can’t figure out what this thing is on the hull. In instant action I don’t have any problems. But in mission mode [standard, assault, stealth, ecm] all include this huge item, which I can’t identify. I can clearly see ‘C4’ written on the side of the tanks, but can’t figure out what it is.

[url=http://img8.exs.cx/my.php?loc=img8&image=shot00000rp.jpg:3dol18ud]

Direct Link: http://img8.exs.cx/img8/8439/shot00000rp.jpg

[img=http://img8.exs.cx/img8/8439/shot00000rp.th.jpg]

Thanks for any help.:)