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USCode TITLE 10 > Subtitle A > PART I > CHAPTER 13 > § 311

§ 311. Militia: composition and classes

(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 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.