Any of the following acts are not considered Copyright infringement:
Publication, Distribution, Communication, and/or Reproduction of State emblems and national anthem in accordance with their original nature;
Any Publication, Distribution, Communication, and/or Reproduction executed by or on behalf of the government, unless stated to be protected by laws and regulations, a statement to such Works, or when Publication, Distribution, Communication, and/or Reproduction to such Works are made;
...
Reproduction, Publication, and/or Distribution of Portraits of the President, Vice President, former Presidents, former Vice Presidents, National Heroes, heads of State institutions, heads of ministries/nonministerial government agencies, and/or the heads of regions by taking into account the dignity and appropriateness in accordance with the provisions of laws and regulations.
This work is in the public domain in the U.S. because it is an edict of a government, local or foreign. See § 313.6(C)(2) of the Compendium of U.S. Copyright Office Practices, 3rd ed. 2014 (Compendium (Third)). Such documents include "legislative enactments, judicial decisions, administrative rulings, public ordinances, or similar types of official legal materials."
These do not include works first published by the United Nations or any of its specialized agencies, or by the Organization of American States. See Compendium (Third) § 313.6(C)(2) and 17 U.S.C. § 104(b)(5).
A non-American governmental edict may still be copyrighted outside the U.S. Similarly, the above U.S. Copyright Office Practice does not prevent U.S. states or localities from holding copyright abroad, depending on foreign copyright laws and regulations.