(a) This chapter applies to a municipal or county employee who is a member of a reserve component of the armed forces of the United States, including any appropriate part of the state military forces, and who by virtue of that membership is called to active duty in the armed forces of the United States by federal authority without the person‘s consent before, on, or after the effective date of this chapter as part of a partial or total mobilization of the reserve components of the armed forces.
(b) This chapter does not apply to a person who:
(1) ceases to be employed by a municipality or county because the person resigns or is terminated for a reason that is not a direct consequence of the person’s call to active duty as described under Subsection (a); or
(2) commits a voluntary act that extends the person’s original assigned service to active duty.