The main way to farm Epic gear at the moment is to S rank an Extreme Event/Weekly or Daily Co-op Mission, while getting the lower A rank will make participants eligible to occasionally get some of that equipment.
then, How do you get other classes in Metal Gear survive?
There is one main class and four subclasses in Metal Gear Survive. You unlock the four subclasses—Assault, Jaeger, Medic, and Scout—after completing a mission for Virgil to acquire another memory board after beating the story.
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