The problem with all of our weapons is that the al-Qaida navy will not look like this:
But it could likely look more like this:
or much bigger of course...
...or this:
Neither of these types of vessels have had much difficulty crossing borders anywhere. We read of Chinese illegal immigrants making it right to US Shores, never mind the myriad of such landings in Europe.
But the al-Qaida creeps might go for an easier target that couldn't possibly avoid them...
Suppose they planned on using their 15 pitiful little ships to sink 15 Ocean Liners in one day... couldn't happen?
Both of the above types of ships can get very close to ocean liners like this. Even 15 at a time. Al-Qaida might even have a better disguise...
Nah, they wouldn't dare...