Quoting Steven Woosey
Hello I have just joined and I have MW2 MW1 CoD2 CoD3 CoD finest hour.If you have done the game then when you go in to mission select it will say act1 act2 act3 and museum. Select museum and you might want to stock up on ammo. Now, go to the information desk and it should say "do NOT press X" press X and the wax people will come alive and try to kill you. In the other room (not the one with vehicles) there will also be a notice/warning saying "do NOT press X" do it and they will come alive there is one guy called the Juggernaut and he is nearly invincible. Either use the RPG-7 or use the Barret.50 cal and with that beauty it only takes 3 shots to the head. I typically kill the Juggernaut before I press X. Hope this helped!