Is recalling a regular action you can do at any time to bring a unit back to base, or does it require a card to specifically state 'recall'?

Ruling: Recall is a specific action that only occurs when a card effect explicitly states "recall." It is not a standard action available at any time. Recall does not count as moving.

Nuances:

• Using a standard move action to bring a unit from the battlefield to base is not a recall
• Recalls are limited actions that happen during specific moments
• Units can only move via card effects or by using the standard move action (exhausting to move)