; and (B) prepare such records for transmission to the Archivist for inclusion in the Collection. (2) Prohibitions (A) Destruction; alteration; mutilation No unidentified anomalous phenomena record shall be destroyed, altered, or mutilated in any way. (B) Withholding; redaction; postponement of disclosure; reclassification No unidentified anomalous phenomena record made available or disclosed to the public prior to the date of the enactment of this Act may be withheld, redacted, postponed for public disclosure, or reclassified. (C) Records created by non-Federal persons or entities No unidentified anomalous phenomena record created by a person or entity outside the Federal Government (excluding names or identities consistent with the requirements of section 1843) shall be withheld, redacted, postponed for public disclosure, or reclassified. (b) Custody of unidentified anomalous phenomena records pending review During the review by the heads of Government offices under subsection (c), each head of a Government office shall retain custody of the unidentified anomalous phenomena records of the office for purposes of preservation, security, and efficiency, unless it is a third agency record described in subsection (c)(2)(C). (c) Review by heads of Government offices (1) In general Not later than 300 days after the date of the enactment of this Act, each head of a Government office shall review, identify, and organize each unidentified anomalous phenomena record in the custody or possession of the office for— (A) disclosure to the public; and (B) transmission to the Archivist. (2) Requirements In carrying out paragraph (1), the head of a Government office shall— (A) determine which of the records of the office are unidentified anomalous phenomena records; (B) determine which of the unidentified anomalous phenomena records of the office have been officially disclosed or made publicly available in a complete and unredacted form