§ 4083.
Persons convicted of offenses against the United States or by courts-martial punishable by imprisonment for more than one year may be confined in any United States penitentiary.
A sentence for an offense punishable by imprisonment for one year or less shall not be served in a penitentiary without the consent of the defendant.
([June 25, 1948, ch. 645], [62 Stat. 850]; [Pub. L. 86–256], Sept. 14, 1959, [73 Stat. 518].)