Michigan Compiled Laws, Chapter 32. Military Establishment § 32.49b

Sec. 49b. Officers hereafter retired under the provisions of section 49a of this act  1 who, prior to such retirement, shall have had not less than 20 years active service in the Michigan national guard including not less than 10 years commissioned service, and who shall also have had not less than 10 years of actual duty service as defined in this act, shall, upon reaching age 60 or over age 60 and under age 64, be entitled to and shall be paid retirement pay upon the same basis as is prescribed for officers' retirement pay under the provisions of section 49 of this act,  2 so long as they remain eligible to continue to be enrolled on such retired list: Provided, That any other officer retired under the provisions of section 49a, having not less than 20 years service, including not less than 10 years commissioned service, shall, upon reaching age 60, be paid retired pay of $480.00 a year. All officers so retired shall be subject and liable to the same regulations and conditions of temporary or other military service of the state as apply to officers retired under sections 35 and 49  3 and other pertinent provisions of this act.

Applications for retirement under section 49a and this section shall be referred to special retirement boards of officers detailed by order of the governor, and shall consist of not less than 3 officers and not more than 5 officers, and, if practical, senior in rank to the officer applying for or subject to retirement. Such retirement boards shall perform the same duties with relation to such retirement as are performed by similar boards appointed or detailed under the regulations of the regular army of the United States. The findings and recommendations of such retirement boards shall be subject to the approval of the governor in each case.

The retirement or re-retirement of officers, warrant officers and enlisted men of the Michigan national guard, because of reaching age 64, shall continue to be effected under the provisions of section 49 of this act.