5-4. In large-scale ground combat operations against a peer threat, commanders conduct decisive action to seize, retain, and exploit the initiative. Decisive action is the continuous, simultaneous execution of offensive, defensive, and stability operations or defense support of civil authority tasks (ADP 3-0). Operations conducted outside the United States and its territories simultaneously combine three elements—offense, defense, and stability. Within the United States and its territories, decisive action combines the elements of defense support of civil authorities and offense and defense to support homeland defense, when required.