[GSlob]

Well, the possible countermeasure is to keep a small group of [creative engineering types] to play the enemy part and come up with crazy- and not-so-crazy ideas. For example, there are only so many means of aerial delivery (rocket, plane, helicopter, glider, parachute, free falling object, air balloon/dirigible, kite, bird/bat, ballistic projectile)... It's probably already done, although there may be bureaucratic hiccups.

[reformedliberal]

I think RightWhale is correct: thrillers and spy flics and video games are the inspiration. We don't need engineers.

We need to distribute some video games that are based on absolutely insane assumptions, but make sure that in the game, the terrorists always win. Then the idiots will spend years trying to duplicate the game's parameters.

[FairOpinion]

"Well, the possible countermeasure is to keep a small group of [creative engineering types] to play the enemy part and come up with crazy- and not-so-crazy ideas."

I think this is a very reasonable idea. They should form a small organization (or a small department within Homeland Security or the intel organizations) with creative people who come up with various scenarios from the enemy's point of view. Engineers and others who think "outside the box", and take the mindset of the enemy into consideration -- that they are perfectly willing to die in the process, to perpetrate a successful attack.

We haven't heard lately, but there was a lot of discussion about divers a while ago.

They could do something very simple or very sophisticated.