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The Mark 38 25 mm MGS provides ships with short-range capability against high-speed maneuvering surface targets (HSMSTs), [5] floating mines, and enemy swimmers. Ships close to land can use the system against enemy personnel and lightly armored vehicles. [2] It is a low-cost weapon that can operate in any weather condition, day or night.
The M242 Bushmaster chain gun is a 25 mm (25×137mm) single-barrel chain-driven autocannon.It is used extensively by the U.S. military, such as in the Bradley fighting vehicle, as well as by other NATO members and some other nations in ground combat vehicles and various watercraft.
In the anti-materiel role, a 25 mm weapon armed with armor-piercing rounds can disable many types of aircraft and ground vehicles, including some main battle tanks. The US military uses 25 mm weapons in their AV-8B Harrier, AC-130 gunship, M2 Bradley, LAV-25, F-35 Lightning II and as a standard ship-based munition in the Mk 38 autocannon.
The class will undergo sensor upgrades, with the US government providing SAAB AN/SPS-77 Sea Giraffe AMB 3D air/surface search radars, [1] FLIR Systems SEAFLIR 230 electro-optical/infra-red (EO/IR) system, and BAE Systems Mark 38 Mod.2 25mm gun systems under FMS & FMF programs. A separate upgrade program funded by the Philippine Navy will see ...
The Mark 12 5"/38-caliber gun was a United States dual-purpose naval gun, but also installed in single-purpose mounts on a handful of ships. The 38- caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun .
6"/50 caliber Mark 6 and 8 guns United States: 1900s - World War I - World War II 152.4 mm (6.00 in) 6"/53 caliber Mark 12, 14, 15 and 18 guns United States: 1920s - World War II 152.4 mm (6.00 in) 6"/47 caliber Mark 16 and 17 gun United States: World War II - 1970s 155 mm (6.1 in) Canon de 155 mm Modèle 1920 50-caliber France: World War II
The vessels are armed with a remote-control Mark 38 25 mm Machine Gun System and four crew-served .50-caliber (12.7 mm) M2HB heavy machine guns. They have a bow thruster for maneuvering in crowded anchorages and channels. They have small underwater fins, for coping with the rolling and pitching caused by large waves.
The United States planned to acquire 48 Mark VI boats. Only 12 were ordered in 2015 and delivered by 2017. This was due to the crafts not being extensively used, suffering from reliability problems, and considered too expensive to maintain, they held off on ordering any more until 2023. [7] As of 2025 the US currently has 38 Mark VI patrol boats.