Survival lessons: You never know who's a frickin' robot. When the robot apocalypse comes it wouldn't be a bad idea to carry around a knife for poking people to see if blood comes out. Aside from that, the only lessons learned are how not to do things. How not to move in a combat team, how not to hold, carry, and shoot a weapon, what not to wear in combat, etc. The best advice is just not to watch it. Some things in life can attack one's morale and drain your will to survive. This movie is one of them.