(a) Employees who enlisted.--Every military leave of absence granted to an employee by reason of his enlistment in the active military service in time of war or armed conflict, or emergency proclaimed by the Governor or by the President of the United States, shall expire 90 days after the expiration of the first period of his enlistment to expire at a time when the United States is not engaged in a war or armed conflict or emergency proclaimed by the Governor or by the President of the United States.

(b) Employees who were drafted.--Every military leave of absence granted to an employee by reason of his having been drafted shall expire 90 days after the expiration of the period for which he was drafted.

(c) Employees who were members of reserve components.--Every military leave of absence granted to an employee by reason of his having been called or ordered to military duty as a member of a reserve component of the armed forces of the United States shall expire 90 days after the expiration of the period of the military duty. Every military leave of absence granted to an employee by reason of his having been ordered to active State duty or special State duty as a member of the Pennsylvania National Guard shall expire 30 days after the expiration of the period of the State duty.