I was playing the Allied campaign again, starting with training, when I noticed something I had never seen, mainly since I never do the training. If you dont destroy the ruined tank, and keep going, you will find another broken bridge. I had to use TibEdit to turn my GIs into engineers, and change the deploy weapon into the grand cannon so I could still destroy the targets (as an engineer you cant attack the targets, you need the GC for splash damage) After crossing the second bridge it tells you youre not supposed to be there, but ill let you guys find out whats there.
Nothing spectacular, but still pretty cool.