good strategy would be to upgrade flak gun and shield capacitor thingie and then just keep the flak firing and the shields on with the capacitor. with this you can get to score 15000.
Dude! You just completed the Duck and Cover achievement in MAD: Mutually Assured Destruction and won the Duck and Cover badge and 30 points! yay i got 3901 missiles endured!!
 "MAD: Mutually Assured Destruction"){kind=icon}