I watched this movie on VHS in the late 90s. I think it was an american movie. It’s science fiction, maybe post-apocalyptic. A group of military men walk through the desert and caves, dressed like in combat armor like in the game “Fallout 1-2” (not power armor, but combat armor). One of them carries a heavy machine gun, characteristically leaning back, as in the same game. Why they go, with whom they fight – I don’t remember at all.