TITLE 10 - ARMED FORCES
Subtitle A - General Military Law, PART I - ORGANIZATION AND GENERAL MILITARY POWERS

CHAPTER 13 - THE MILITIA
Sec. 311. Militia: composition and classes

-STATUTE-

      (a) The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32,* under 45 years of age (32USC313:  "or under 64 years of age and a former member of the Regular Army, Regular Navy, Regular Air Force, or Regular Marine Corps") who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard.

      (b) The classes of the militia are -

        (1) the organized militia, which consists of the National Guard and the Naval Militia; and

        (2) the unorganized militia, which consists of the members of the militia who are not
                members of the National Guard or the Naval Militia.