I can't help but think that in the same way that Terrorism has won by forcing us to strip off belts, shoes etc. at airport security; the villains will be dead chuffed to see police helicopters grouped together in hangars miles from where they are needed.
That is not to say that the helicopters shouldn't be protected, by lethal force if required
, but don't let the criminals set the game plan.
Cheers
TeeS