My grandson has just returned from a super trip to Vietnam & Cambodia and I have been admiring some of his snaps. I particularly like the ones of him in the tunnel entrances ! Ron
M41 Walker Bulldog. Quite a few pics of it at Cu chi tunnels on the internet. https://www.google.co.uk/search?hl=en&q=m41+tunnels&bav=on.2,or.r_qf.&bvm=bv.51156542,d.d2k,pv.xjs.s.en_US._-554IbEZc0.O&biw=1024&bih=675&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=YX0cUrTYKcmx0QXQiIGACg