NavyShooter said:
The first level of the force continuum....a visible armed presence.
Doesn't have to be WELL armed (that's a benefit though!) but the knowledge that there's someone official around with a gun in case things go bump in the night tends to be a deterrent.
Is a 25mm enough? Is a police officer's 9mm enough?
The knowledge that a fighter-plane, or someone with ESSM's and Harpoons can show up in reasonably short order in support can make it enough.
Would it be nice to have something with a bit more horsepower under the hood? Yeah, but is an extra 51mm going to make that much difference?
NS
IMO, the extra 51mm
does make a significant difference, and the extra 75mm (for the AK-100) or even 102mm (for a 5") would make an even bigger difference! Why? Because these naval guns provide a much wider array of capabilities that the 25mm does not possess.
The 25mm is going to be very good at defending against small, fast movers, and it is more than sufficient as a deterrent against unarmed vessels, such as illegal fisherman or merchies who refuse to heave-to. In order for it to be effective in naval combat, you need to be in fist-shaking range of the other vessel!
With a 76mm (or greater) you have extended range and an NGS capability. Planning on landing some troops on an active island? Think again, because I'm about to bombard them with 5" HE rounds. In arctic ice, will your ship even be able to manoeuvre in order to close into 25mm range? Have no fear! My Ak-100 will hit them from outside the ice sheet! (maybe...)
This is why sticking Sizzlers on their patrol ships is even more menacing: it provides even greater range and lethality. Even though their patrol boats lack any AA or Anti-ASM capability (chaff, jammers, or point defence missiles), they're mere presence can be huge deterrence, because you don't know when an SS-N-27 is going to pop-up over the horizon and ruin your AOPs day.
Do I think we need (or can) get in an arms race with the Russians and start putting ASMs on our AOPs? Absolutely not; but I do think we should posses a minimum level of capability across of wider spectrum of warfare areas.