The new Mark 38 Mod 4 30mm naval gun system on display on MSI Defence stand at Sea Air Space 2022. Photo: Naval News

Army Recognition’s Navy News reports,

“…on 11 June 2025 … a public tender released via the official German e-procurement platform marks the beginning of a strategic modernization effort in the German Navy’s close-range defense capabilities. In a context where drones and asymmetric threats are playing an increasingly prominent role in contemporary conflicts, the Bundeswehr is initiating a structural transformation of its naval weapons systems.

“At the core of this reform is the introduction of a new 30×173 mm caliber, intended to progressively replace the currently deployed 27 mm light naval guns. This development aims to improve effectiveness against light aerial targets, especially drones, but also surface and land-based threats, by using programmable airburst munitions. The doctrinal shift reflects operational requirements and signals a lasting change in the defensive posture of German naval vessels.”

The gun that is being replaced is in some respects a better weapon than the 25mm the Coast Guard currently uses. It fires a heavier projectile, over a greater distance and has a much higher rate of fire, but apparently they have decided that an airburst projectile is necessary to deal with the drone threat.

The Coast Guard should probably come to the same conclusion. It now appears that an attack by unmanned air or surface craft is the most likely form of terrorist attack. Air burst projectiles are the best available, reasonably priced, hard kill systems for both self-defense and close in force protection.

Unlike the German Navy, the 30x173mm round is already in service with the US Navy and is expected to arm the Polar Security Cutter.

The new large cutters are getting 57mm guns which should be effective, but the FRCs are the units most likely to encounter this threat. The 30 mm would also be more effective against larger threats. We have been told that it is possible to replace a few parts and upgrade existing 25mm mounts to 30mm mounts. If so, we should be doing this.