This title does not authorize the Maryland Defense Force to be ordered or drafted into the military service of the United States, except by order of the President of the United States acting pursuant to the Constitution and laws of the United States. This provision may not be construed to prohibit service of the Maryland Defense Force or personnel thereof in missions in which federal military personnel are also serving or in command. An individual is not exempt from military service under the laws of the United States because the individual is enlisted, commissioned, or appointed in the Maryland Defense Force.