 By 1910 the US was building the dreadnought-type "South Carolina" class, with a secondary armament composed entirely of 3-inch (76 mm) guns.Although removed from first-line warships by World War I, some 3-pounders were fitted on patrol vessels, with a few weapons serving on those ships through World War II.The most common types of ammunition available for 3-pounder guns were low yield Steel shells and common lyddite shells.