You did the nuke one wrong, you have to pull out the laptop as it detonates not during the countdown. You should be looking at your laptop but not in the killstreak when it detonates. I have done it before I'm not being a little kid and full of shit just letting you know you should try it that way.
These videos taught things i never new. like destroying a AC130 with a predator missile i was always trying to find the plane but i could never find it..its way off the mapp woah!!1