A dysfunctional group of skaters band together to survive when an anti-terrorist exercise turns the residents of their New England island home into blood-sucking zompires.

They MUST band together to survive.

How about;

When an anti-terrorist exercise turns the residents of a New England tourist island into blood craving zompires, a dysfunctional group of skaters band together to escape before the military's containment blast incinerates them all.

Maybe they need to try to reverse the effects of whatever turned the population into zompires, and/or prevent it from spreading to the mainland?

WOW

I would suggest "... band together to survive after an anti-terrorist..."

Also is there a more clearer goal than to survive ??

Other than that congrats on the awesome concept // logline !!

Happy writing :D

Tor