It shall be the duty of each commissioned officer and enlisted person of the Oklahoma National Guard to be present and perform all the duties required of him or her at each assembly for drill and instruction, encampment, maneuvers or other exercises, unless regularly excused by competent authority. Any employer who refuses to permit an employee who may be a member of the National Guard of this state to attend any drill, ceremony, exercise, or any duty which he or she may be legally called upon to perform shall be guilty of a misdemeanor and upon conviction thereof shall be punished by a fine of not less than Fifty Dollars ($50.00) nor more than Two Hundred Dollars ($200.00), or by imprisonment for not less than ten (10) days, nor more than sixty (60) days in the county jail, or by both such fine and imprisonment.