| [edit]Drum Equipment Bonuses
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| Equipment
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Extra Requirement
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Note
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 533mm Quintuple Torpedo Mount (Late Model)
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+2 |
+4 |
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21inch 6-tube Bow Torpedo Launcher (Initial Model)
OR 21inch 6-tube Bow Torpedo Launcher (Late Model)
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(1st equipped)
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+2 |
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One-time
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Submarine 4-tube Stern Torpedo Launcher (Initial Model)
OR Submarine 4-tube Stern Torpedo Launcher (Late Model)
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(1st equipped)
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+2 |
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One-time
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21inch 4-tube Bow Torpedo Launcher (Initial Model)
OR 21inch 4-tube Bow Torpedo Launcher (Late Model)
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(1st equipped)
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+1 |
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+2
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One-time
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 SJ Radar + Submarine Conning Tower Equipment
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(1st equipped)
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+1 |
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+2 |
+2
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One-time
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| Ship-Type Bonuses
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Type D Kouhyouteki Kai (Kouryuu Kai)
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-1 |
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-7
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Late Model 53cm Bow Torpedo Mount (8 tubes)
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(1st equipped) (★8-9)
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+1 |
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One-time
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| (1st equipped) (★MAX)
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+1 |
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+1 |
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One-time
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 Special Type 4 Amphibious Tank
OR Special Type 4 Amphibious Tank Kai
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(★0)
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+1 |
+2 |
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-1
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| (★1-2)
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+1 |
+3 |
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-1
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| (★3-5)
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+1 |
+3 |
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+1 |
-1
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| (★6-9)
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+1 |
+3 |
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+2 |
-1
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| (★MAX)
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+1 |
+4 |
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+2 |
-1
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| Special Type 4 Amphibious Tank Kai
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(★0-1)
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+1 |
+1 |
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+1 |
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| (★2-3)
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+2 |
+1 |
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+1 |
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| (★4-7)
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+2 |
+2 |
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+1 |
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| (★8-MAX)
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+3 |
+2 |
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+1 |
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Late Model Submarine Radar & Passive Radiolocator
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+ Late Model Bow Torpedo Mount (6 tubes) OR Skilled Sonar Personnel + Late Model Bow Torpedo Mount (6 tubes) OR Late Model 53cm Bow Torpedo Mount (8 tubes)
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+3 |
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+2
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One-time
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Late Model Radar & Passive Radiolocator + Snorkel Equipment
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(★3-4)
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+1
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| (★5-9)
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+1 |
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+1
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| (★MAX)
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+1 |
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+1 |
+1
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(★2-MAX) + ★4+ Skilled Sonar Personnel + Late Model Bow Torpedo Mount (4 tubes)
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+7 |
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+5 |
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One-time
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