32 U.S. Code § 906 - Requests for funding assistance
Requests for funding assistanceA Governor of a State may request funding assistance for the homeland defense activities of the National Guard of that State from the Secretary of Defense. Any such request shall include the following:
An explanation of why participation of National Guard units or members, as the case may be, in the homeland defense activities is necessary and appropriate.
A certification that homeland defense activities are to be conducted at a time when the personnel involved are not in Federal service.