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CPR should be performed on a casualty who is in cardiac arrest during evacuation because it is a critical intervention that can significantly increase the chances of survival. Cardiac arrest is a life-threatening condition where the heart stops pumping blood effectively, leading to a lack of oxygen in the brain and other vital organs. By providing CPR during evacuation, the rescuer can help maintain blood circulation and oxygenation to this casualty until more advanced medical help can be reached, thus improving the likelihood of a positive outcome.

In tactical situations, immediate action is essential, and performing CPR as soon as a cardiac arrest is recognized is critical. This aligns with the principles of Tactical Combat Casualty Care, which emphasize the importance of performing life-saving interventions in a timely manner, especially in high-stress or tactical environments.