Sailors assigned to the forward-deployed amphibious assault ship USS Essex (LHD 2) load ammunition into a MK 15 Phalanx Close-In Weapons System (CIWS). (U.S. Navy photo by Mass Communication Specialist 3rd Class Casey H. Kyhl/Released)

That is the Phalanx Block 1B.

From that 2006 post:

Here’s a nifty diagram of the Phalanx family evolution from Block 0 up to the Block 1B (and actually beyond Block 1B and into the SEA RAM program which replaces the 20mm gun with a Sea Sparrow/Sidewinder mongrel missile for greater range…but that’s another post). Click for a better look:

I know that there is a SeaRAM (which replaces the 20mm gun with a Rolling Airframe Missile launcher) on the USS Independence (LCS 2) but I don’t know if any other ships have it yet.

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