To amend title 10, United States Code, to provide that members of the National Guards who served in the counties declared disasters in response to the September 11, 2001, terrorist attacks, and who served under State duty so that they could immediately assist in the response to the terrorist attacks should have that service counted as Federal active duty for purposes of military retirement credit.

Authorizes members of the National Guard who, immediately after the terrorist attacks of September 11, 2001, served in counties declared Federal disaster areas as the result of those attacks to count such service as Federal active duty for purposes of military retirement credit.

Makes this Act retroactively effective to benefit those members of the National Guard who became entitled to retired pay between September 11, 2001, and the date of enactment.