The honorable discharge upgrade is a must though, because it makes your yari minisubs very cost effective at taking out enemy units and makes even those yaris that are about to die useful in battle.

• 死的光荣升级是必须的，因为它可以让你的迷你潜艇在干掉敌人时的性价比更高，使迷你潜艇即使是死掉也死得值得。