Well those photos were taken from deck level- maybe on the bridge wings. Many warships now have EO/FLIR sensors on their masts nearly doubling the horizon for them.
Sky I think you should read up on what the capabilities of the USN's 5 in gun. Its has the speed of traverse and accuracy to shoot down subsonic missiles. It has been combat proven against such small craft back during the tanker war. The Ticonderoga class CG that shot down the Iranian Jet Liner did that while in a gun fight with several Boghammer boats. The CG sank several Boghammers, none of which was able to successfully engage the cruiser.
The smaller Oto Breda 76mm Rapid Fire found on USN frigates, Allied Frigates and USCG Cutters would be even more effective since it has a larger capacity of rounds ready to fire and traverses even faster.
Don't forget the US also has its own small craft that could counter them. The 34' Force Protection Boat comes to mind. It doesn't have the heavy weapons and is a little slower but it has more small arms and better armor. Those Swedish assault boats the USN purchased would also be useful.
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