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In Korea, where destroyers were forced to engage coastal batteries for their own protection during blockade operations and interdiction of rail lines, the 5-inch projectiles lacked lethality. Commander TF 95, responsible for blockade and interdiction efforts of the surface combatants, reported in 1953 that:
"Five inch had little or no effect against coastal defense battery positions unless a direct hit was scored on the aperture thus destroying the gun or sealing off the opening. Short of complete destruction, the Communist shore batteries thus protected returned to action very quickly and in some cases continued firing while under attack. On the other hand, gunfire of heavier caliber from battleships and cruisers had a much greater effect. On occasion batteries were permanently silenced by inflicting such heavy damage that the communists abandoned them. In other cases, they were placed out of action for long periods".
The 5"/38 was also ineffective against communist bunkers and underground personnel shelters, as well as bridges and tunnels. On the other hand, major-caliber projectiles could destroy these targets.
