Ala. Code § 31-2-57

All members of the federally recognized headquarters and headquarters detachment, Alabama Army, Air, and Space National Guard, who are full-time military employees of the state, and other members of the headquarters and headquarters detachment, Alabama Army, Air, and Space National Guard, as the Governor may deem necessary, shall, if authorized by federal military laws and authorities when they or the National Guard and Naval Militia are ordered into the federal service in case of a national crisis, be assigned to duty in the state headquarters in connection with the execution of any national selective service act, the National Defense Act, or any similar federal laws enacted for the purpose of inducting the manpower of this state and of the nation into the military, naval, or other similar emergency service of the United States, in connection with the organization, training, and maintenance of temporary military forces by the state as “home guards” or similar forces and in the operation of the State Military Department, to the extent permitted by federal authorities and not inconsistent with their federal duties.