It was extremely cheap to load a raft with explosives and send it out to try to sink the USS Cole. The Coast Guard is hurting for funds and can't possibly guard the coast. There are a ton of interesting targets along the coast. A hole in an oil tanker at a port city would be enough to cause a big ecological problem, and might even have a geopolitical impact as well.
There, now we have to guard then entire skies AND the entire coast. Geez, this is gonna be expensive.
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