(a) Classification.An offense that is not specifically classified by a letter grade in the section defining it, is classified if the maximum term of imprisonment authorized is
(1) life imprisonment, or if the maximum penalty is death, as a Class A felony;
(2) twenty-five years or more, as a Class B felony;
(3) less than twenty-five years but ten or more years, as a Class C felony;
(4) less than ten years but five or more years, as a Class D felony;
(5) less than five years but more than one year, as a Class E felony;
(6) one year or less but more than six months, as a Class A misdemeanor;
(7) six months or less but more than thirty days, as a Class B misdemeanor;
(8) thirty days or less but more than five days, as a Class C misdemeanor; or
(9) five days or less, or if no imprisonment is authorized, as an infraction.
(b) Effect of classification.Except as provided in subsection (c), an offense classified under subsection (a) carries all the incidents assigned to the applicable letter designation, except that the maximum term of imprisonment is the term authorized by the law describing the offense.
(c) Imprisonment of certain violent felons.
(1) Mandatory life imprisonment.Notwithstanding any other provision of law, a person who is convicted in a court of the United States of a serious violent felony shall be sentenced to life imprisonment if
(A) the person has been convicted (and those convictions have become final) on separate prior occasions in a court of the United States or of a State of
(i) 2 or more serious violent felonies; or
(ii) one or more serious violent felonies and one or more serious drug offenses; and
(B) each serious violent felony or serious drug offense used as a basis for sentencing under this subsection, other than the first, was committed after the defendant’s conviction of the preceding serious violent felony or serious drug offense.
(2) Definitions.For purposes of this subsection
(A) the term "assault with the intent to commit rape" means an offense that has as its elements engaging in physical contact with another person or using or brandishing a weapon against another person with intent to commit aggravated sexual abuse or sexual abuse (as described in sections 2241 and 2242);
(B) the term "arson" means an offense that has as its elements maliciously damaging or destroying any building, inhabited structure, vehicle, vessel, or real property by means of fire or an explosive;
(C) the term "extortion" means an offense that has as its elements the extraction of anything of value from another person by threatening or placing that person in fear of injury to any person or kidnapping of any person;
(D) the term "firearms use" means an offense that has as its elements those described in section 924(c) or 929(a), if the firearm was brandished, discharged, or otherwise used as a weapon and the crime of violence or drug trafficking crime during and relation1 to which the firearm was used was subject to prosecution in a court of the United States or a court of a State, or both;
(E) the term "kidnapping" means an offense that has as its elements the abduction, restraining, confining, or carrying away of another person by force or threat of force;
(F) the term "serious violent felony" means) (i) a Federal or State offense, by whatever designation and wherever committed, consisting of murder (as described in section 1111); manslaughter other than involuntary manslaughter (as
1So in original. Probably should be "in relation".