Otacon: If you can shoot a Stinger missile into the cockpit, you'll destroy the computer control system.
Snake: You intentionally designed it with a weak point?
Otacon: It's not a weak point. I like to think of it as a character flaw. People just aren't complete without some type of character flaw, don't you think?
"What took a particularly annoying number of attempts was a bit towards the end where my sole instruction was to "take out the tank." But while the tank's weak spot was completely obvious — cause it was the bit behind intermittently closing armor plating — it didn't actually become a weak spot until I'd shot all the tank's wheels off. Oh yeah, obviously! Should've guessed that the wheels are where the enemy keeps all their magic monkey paws and four leaf clovers."