Sentencing classification of offenses

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— 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— 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— For purposes of this subsection— the term “serious violent felony” means— the term “serious drug offense” means— Robbery, an attempt, conspiracy, or solicitation to commit robbery; or an offense described in paragraph (2)(F)(ii) shall not serve as a basis for sentencing under this subsection if the defendant establishes by clear and convincing evidence that— Arson shall not serve as a basis for sentencing under this subsection if the defendant establishes by clear and convincing evidence that— Subject to paragraph (2) and notwithstanding any other provision of law, a person who is convicted of a Federal offense that is a serious violent felony (as defined in subsection (c)) or a violation of section 2422, 2423, or 2251 shall, unless the sentence of death is imposed, be sentenced to imprisonment for life, if— For the purposes of this subsection— the term “State or Military sex offense” means an offense under State law or the Uniform Code of Military Justice that is punishable by more than one year in prison and consists of conduct that would be a Federal sex offense if, to the extent or in the manner specified in the applicable provision of this title— An offense described in section 2422(b) or 2423(a) shall not serve as a basis for sentencing under this subsection if the defendant establishes by clear and convincing evidence that— A person who is convicted of a Federal offense that is a crime of violence against the person of an individual who has not attained the age of 18 years shall, unless a greater mandatory minimum sentence of imprisonment is otherwise provided by law and regardless of any maximum term of imprisonment otherwise provided for the offense— As used in this section—