A bill to make rules respecting military hostilities in the absence of a declaration of war.

Establishes rules to govern the Armed Forces in military hostilities where there is no declaration of war.

Specifies that the Armed Forces may act to: (1) repel a sudden attack of the United States; (2) repel an attack against the Armed Forces on the high seas or while lawfully stationed in a foreign territory; (3) protect United States nationals abroad; and (4) comply with a national commitment resulting from a treaty or other legislative instrumentality intended to give effect to such commitment.

Provides for cut off of military hostilities after 30 days unless such hostilities are sustained by legislative enactments or by a declaration of war.

Excludes from coverage under this Act military hostilities undertaken before the effective date of the Act.