would travel at Mach 3, half the speed of a railgun but twice the speed of conventional rounds. The rounds would be more expensive than unguided shells but cheaper than missile interceptors, and engage air and missile targets out to . During 2018 RIMPAC exercises, the fired 20 HVPs from a standard Mk 45 deck gun; an HVP shell could cost US$75,000-$100,000, compared to $1-$2 million for missiles. Operators Current operators Royal Australian Navy Anzac-class frigate: Mod 4 (upgraded from Mod 2) Hobart-class destroyer: Mod 4 Royal Danish Navy Absalon-class frigate: Mod 2 Hellenic Navy Hydra-class frigate (MEKO 200 HN) Mogami-class frigate: Mod 4 Atago-class destroyer: Mod 4 Maya-class destroyer: Mod 4 Akizuki-class destroyer: Mod 4 Asahi-class destroyer: Mod 4 Republic of Korea Navy Sejong the Great-class destroyer: Mod 4 Chungmugong Yi Sun-sin-class destroyer: Mod 4 Incheon-class frigate: Mod 4 Royal New Zealand Navy Anzac-class frigate: Mod 2 Spanish Navy Álvaro de Bazán-class frigate: Mod 2 Republic of China Navy Kee Lung-class destroyer Royal Thai Navy Naresuan-class frigate: Mod 2 (being upgraded to Mod 4) Turkish Navy Barbaros-class frigate (MEKO 200 TN II) Yavuz-class frigate (MEKO 200 TN I) United States Navy Active service ships: Ticonderoga-class cruiser: Mod 2 CG-52-73: Mod 4 after receiving the cruiser modernization Arleigh Burke-class destroyer: DDG 51–80: Mod 2 DDG 81–112: Mod 4 Decommissioned: California-class cruiser Kidd-class cruiser Spruance-class destroyer Tarawa-class amphibious assault ship (later removed) Virginia-class cruiser Future operators Royal Australian Navy Hunter-class frigate: 9 ships ordered Royal Navy Type 26 frigate: 8 ships ordered, 3 in build (Mod 4) Turkish Navy TF2000-class frigate: 7 in planned See also Extended Range Guided Munition: long range (~) precision guided projectile program by Raytheon for the Mark 45 gun, canceled in 2008 Advanced Gun System: The gun on s (unusable; no ammunition) Weapons of comparable role, performance and era Otobreda 127/54 Compact and Otobreda 127/64: contemporary 127 mm naval gun from Italian manufacturer Oto Melara 4.5 inch Mark 8 naval gun: contemporary standard naval gun for British ships AK-130: contemporary 130 mm twin standard naval gun mounting for Russian ships H/PJ-38 130mm naval gun : contemporary 130 mm standard naval gun mounting for Chinese ships French 100 mm naval gun: contemporary standard naval gun for French ships References Notes Bibliography External links US Navy Fact File – 5"/54 caliber Mark 45 gun BAE Systems: Mk 45 Mod 4 Naval Gun System BAE Systems: Mk 45 Naval