''An air defense balloon operated to protect naval vessels and facilities from enemy air attack.<br>Although it cannot be used by ships moving at high speed, it is effective in local battlefields to protect ships during landing battles, and ground facilities from enemy air attacks.<br>Many were notably used in the Normandy landing operations.<br>As it is difficult to operate and has limited effectiveness, it will gradually disappear.
==Mechanics==
==Mechanics==
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==Notes==
==Notes==
===How To Obtain===
===How To Obtain===
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''Event reward for:''
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* [[Summer 2023 Event]]
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**E-5: Hard (x3), Medium (x2), Easy
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**E-6: Hard (x2, choice), Medium (choice), Easy (choice), Casual (choice)