Officers, warrant officers, and enlisted men of the National Guard or Naval Militia of Alabama, after being called, drafted, or ordered into the federal service, shall, upon being relieved from active duty in the military and naval service of the United States, as individuals and units revert to their National Guard or Naval Militia status and shall continue to serve in the National Guard or Naval Militia until the dates upon which their enlistments, entered into prior to the call, draft, or order into the active service of the United States, would have expired if uninterrupted.