(a) General rule.--When any or all of the units and members of the Pennsylvania National Guard are ordered into the active military service of the United States, they stand relieved from duty in the Pennsylvania National Guard during the period of such active military service, irrespective of the term of their existing commissions or enlistments. Their prior status as units and members of the Pennsylvania National Guard continues to exist as an underlying and temporarily suspended status of origin to which they may and do return upon relief from the active military service of the United States.
(b) Termination of service.--When the duration of their active military service of the United States is of such a duration and units and members so intermingled with other organizations and units of the armed forces of the United States that makes it impracticable for the units and members to return to that prior status as units and members of the Pennsylvania National Guard and it therefore becomes necessary to completely reorganize the Pennsylvania National Guard, former members, who accept a commission or enlist in the reorganized Pennsylvania National Guard under the conditions then applicable and prior to the date of Federal recognition, shall have their service for the purpose of longevity, State retirement, medals and awards count as continuous and uninterrupted.