David Crist writes in today's NY Times that Iran's small boats are actually a big problem that we've known about for years.

In December, the Whidbey Island, a Navy dock-landing ship, fired warning shots at small Iranian craft that came too close. Three days later the frigate Carr was forced to use its ship’s horn to ward off three Iranian small boats, two of which were armed, according to Navy spokesmen. While these incidents may not seem alarming to those who’ve never served on a potentially vulnerable modern warship, they fit into a worrisome pattern, a two-decade-old military strategy by Iran intended to counter the United States presence in the Persian Gulf.
Iran's Small Boats Are a Big Problem, David Crist, NY Times