What, the Navy's ships aren't armed any more?

This from CNN:

The U.S. military reported Monday on a "significant" confrontation involving five Iranian Revolutionary Guard boats that "harrassed and provoked" three U.S. naval ships in international waters over the weekend.

U.S. military officials said the incident occurred Saturday night in the Strait of Hormuz, a narrow shipping channel leading in and out of the Persian Gulf.

In fairness, the ships' crews were reported preparing to fire when the Iranians ran away, but why even give them the chance? Just sink the mf's and be done with it. Let's see how well the Revolutionary Guard can swim.