What is a manifest function of a married father joining the military

The answer to this question is fairly sociological. To spend his life away from the family while serving the country would still remain the the same as any father in the world. To grant the financial and emotional support to his beloved family while risking his life out in the field.

Explanation:

Manifest Functions are those kind of functions which are deliberately performed with full consciousness in order to obtain an intended positive outcome i. e., providing a person 'X' transport from one place to another, getting an education from an institute in order to graduate and get a job for a living.

Manifest - he supports his family, fights for a living. He will support his family while he fights for a living it is basically his job. By fighting in war that is what income his family will get