Every unit of the Mississippi National Guard and the individual members thereof shall, unless excused by proper authority, participate in such field training, armory drills, training assemblies, inspections, musters, ceremonies, parades and other military training or military duty as may be prescribed by the laws and regulations of the United States relating to the National Guard or prescribed by the laws of this state or by the order of the Governor. The discipline of the National Guard shall conform to the system of discipline which is now or may hereafter be prescribed by the United States government for the National Guard, or where applicable for the active Armed Forces of the United States, and the training shall be conducted so as to conform to the applicable regulations of the United States governing training of the National Guard. Any officer, warrant officer or enlisted man who shall fail to report for or participate in or perform any such training, drill, assembly, inspection, muster, ceremony, parade or other military duty, after having first been ordered by his superior officer so to do and not having been excused therefrom by proper authority, shall be guilty of a misdemeanor and upon conviction thereof shall be punished by a fine not to exceed Five Hundred Dollars ($500.00) or by imprisonment not to exceed thirty (30) days, or by both fine and imprisonment. For purposes of this section, a person shall be deemed to have been ordered to report for, participate in and perform military training or military duty if the same has been scheduled and notice thereof given to members of the unit in the manner prescribed by applicable regulations and customs of the service. Any member of the National Guard shall have an opportunity to explain any mitigating circumstances which may have caused an unauthorized absence under this section.