From Wired’s Danger Room:

The boats have drawn comparison to Vietnam-era Patrol Fast Craft boats, or Swift Boats. But they’re a bit smaller, with a length of 34 feet in comparison to the Swift Boat’s 50. Swift Boats were also armed with high-explosive mortars, which will not be on board the gunboats. Still, they’re pretty menacing. The gunboats will reportedly carry an arsenal of six mounted machine guns apiece.