Credit where credit is due:

I think the original gun design comes from Keith Goldman:

http://www.brickshelf.com/cgi-bin/gallery.cgi?m=KGoldman

The colour scheme, obiouvsly Delta Force and some serious influence from the film Blackhawk Down.  But check out Luke Frater's Little Bird Helicopter:

http://www.brickshelf.com/cgi-bin/gallery.cgi?f=55044