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The opening anti-submarine attack (OASW) can be performed by any ship with displayed ASW value of 100 or greater (ship's ASW stat + ''any'' equipment ASW stats, not counting equipment [[improvements]]) and at least one [[sonar]].

The opening anti-submarine attack (OASW) can be performed by any ship with displayed ASW value of 100 or greater (ship's ASW stat + ''any'' equipment ASW stats, not counting equipment [[improvements]]) and at least one [[sonar]].

*{{ShipLink|Isuzu Kai Ni}} and {{ShipLink|Tatsuta Kai Ni}} can always perform OASW, even with less than 100 displayed ASW or without any ASW equipment.

*{{ShipLink|Isuzu Kai Ni}}, {{ShipLink|Tatsuta Kai Ni}}, {{ShipLink|Jervis Kai}} and {{ShipLink|Samuel B. Roberts Kai}} can always perform OASW, even with less than 100 displayed ASW or without any ASW equipment.

*{{ShipLink|Jervis Kai}} is capable of performing OASW when equipped with a Sonar, regardless of her ASW stat.  

*{{ShipLink|Taiyou}} can perform OASW with [[Type 97 Torpedo Bomber (931 Air Group)]] or [[Tenzan (931 Air Group)]] and displayed ASW of 65 or greater. For {{ShipLink|Taiyou/Kai}} and {{ShipLink|Taiyou/Kai Ni}} the bombers are not required, 65 displayed ASW is sufficient (however, if she is not using a torpedo or dive bomber with ASW stat, she will be able to perform OASW attack but will be unable to perform ASW attacks in the shelling phase). OASW attacks will be performed even if she is at medium damage or all her planes were shot down.

*{{ShipLink|Taiyou}} can perform OASW with [[Type 97 Torpedo Bomber (931 Air Group)]] or [[Tenzan (931 Air Group)]] and displayed ASW of 65 or greater. For {{ShipLink|Taiyou/Kai}} and {{ShipLink|Taiyou/Kai Ni}} the bombers are not required, 65 displayed ASW is sufficient (however, if she is not using a torpedo or dive bomber with ASW stat, she will be able to perform OASW attack but will be unable to perform ASW attacks in the shelling phase). OASW attacks will be performed even if she is at medium damage or all her planes were shot down.

*[[:Category:Coastal Defense Ships|Coastal Defense Ships]] can perform OASW with displayed ASW of 60 or greater. With displayed ASW of 75 or greater and equipment ASW of 4 or greater they can perform OASW without a sonar equipped.

*[[:Category:Coastal Defense Ships|Coastal Defense Ships]] can perform OASW with displayed ASW of 60 or greater. With displayed ASW of 75 or greater and equipment ASW of 4 or greater they can perform OASW without a sonar equipped.