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WASHINGTON (AP) _ President Bush on Friday gave the Pentagon authority to call 50,000 reservists to active duty for ``homeland defense'' and other missions in response to the terrorist attacks on New York and Washington.

A brief Pentagon announcement said the military services have thus far identified requirements for 35,500 reservists: 13,000 in the Air Force, 10,000 in the Army, 3,000 in the Navy, 7,500 in the Marine Corps and 2,000 in the Coast Guard.

No further breakdown was provided.

The Pentagon did not say exactly when the reservists would be put on active duty.

The reservists will be assigned to the following missions: port operations, medical support, engineer support, general civil support and homeland defense.