The vocational enterprises program shall be diversified both as to location and kind and shall have for its purposes:
(1) The training and employment of offenders in such job skills and tasks as will afford them the most favorable opportunities practicable for gainful employment upon discharge from the department;
(2) The manufacture or provision, so far as practicable, of such goods or services as are, or may be, needed and used by a department, agency, or institution of the state or any political subdivision of the state, any state employee, or any not-for-profit public or private agency;
(3) The servicing, maintenance, and repair, so far as practicable, of machinery and equipment used by any department, agency or institution of the state or any political subdivision thereof.