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Put several of these on a ship and you could change the classic definition of a battleship. I can imagine a three gun battery, 2 forward and 2 aft (total of 12 guns), each with a fire arc of roughly +/- 100 degrees or so from centerline.

Depending on the fire rate, that configuration could drop a whole lot of ordnance on a very small target. And a Battleship could carry a WHOLE lot of rounds.

As a combined arms force, this would also be interesting in an aircraft for theater level ground support.

I suspect that there will need to be a whole lot better fire direction control between services. Down to the point where a Army forward observer (or drone operator or satellite image interpreter) could call on all three services to pound a target.

A current criticism against the US Navy is that its fire support mission has not gotten adequate attention in recent years. Even to support troop landings, the Navy has little willingness to get and linger close enough to a defended shore to risk getting hit with a barrage of anti-ship missiles.

With gun ranges in the hundreds of miles though, the naval gunfire support mission becomes viable again. More broadly, hostile littorals become vulnerable to sustained US naval gunfire. Adversaries near the sea would find that airpower was not the only option against them, with expensive air defenses rendered inadequate to defend against sustained gunfire from the US Navy.