I've been trying to find this movie for years. I can't remember what year it came out but it must've been the 80's or 90's. The movie was about these two warring cities on a world covered in ice. A squad of soldiers is sent to the enemy city to end the war by blowing it up, the only problem is there is this giant ice or Crystal wall that's protecting the city and it kills anyone not authorized to be there. They wore body armor that mostly covered them and a snowy like camo. I remember the main characters father was a general who disappeared trying to reconcile the two cities and when he gets past the wall he finds his remains. I even remember a scene where the main character has to cut a bioidentificaion out of an enemy and put it in his mouth because it must be surrounded by living tissue to function. I clearly remember nearly the entire plotline of this movie but not the title or actors.