Final answer:
Operating at a critical level of service continuously for periods of more than 72 hours must be approved by the appropriate governing body or authority. In the case of military operations, the President of the United States must seek congressional confirmation within 48 hours and congressional approval beyond 60 days.
Step-by-step explanation:
Operating at a critical level of service continuously for periods of more than 72 hours must be approved by the appropriate governing body or authority. In the case of military operations, for example, the President of the United States can send troops to other countries for hostile reasons but must seek congressional confirmation within 48 hours and congressional approval beyond 60 days as stated in the War Powers Resolution.