For the purpose of coordinating and making more effective the field and similar classes of instruction and training in organizations of the National Guard jointly maintained by Mississippi and any other state or states during periods of field or similar training, as provided under the National Defense Act, the units and personnel of the Mississippi National Guard may, if authorized by the federal government, be placed under the supervision and command of higher organization commanders, who are now or may hereafter be appointed from other states, and whose appointments have the approval of this state, and the states concerned, and such officer is federally recognized. This requirement shall not be carried out unless and until the state or states jointly interested in a National Guard organization with Mississippi shall have enacted a similar law. The objects of this section may be carried out with the consent of the Governor, without regard to similar laws enacted by other states, with the advice and approval of the ranking officer of the Mississippi National Guard present at the place of training and instruction and in command of the Mississippi troops concerned. For the purpose of fixing the time limits of the periods mentioned in this section, the periods of training shall begin when units have cleared their armories or bases and are en route to training assembly areas and shall end when units have returned to their armories or bases from field training period. Mississippi troops shall not be required to yield authority and supervision of matters concerning transportation in or out of the camp or other military area, finance, and supply which concern Mississippi only in her relations with the federal government and for which the state is directly responsible to the federal government. The commanding officer appointed from another state, and such other officers of his command as he may designate, who are members of organizations in which Mississippi has joint interest in other states, and who are appointed and recognized in accordance with laws, rules and regulations prescribed by the federal government may, with the approval of the Governor, make tours of inspection and policy visits with the units of their organizations of the National Guard of Mississippi at their home stations or at other places, at such times as are mutually agreeable, it being understood that the state is not responsible or liable for any expenses incident to such visits.