In this new section of chapter 10 in the newly published 17th edition of the Chicago Manual of Style, “US” may be used in regular running text in reference to the United States in both adjective and noun forms, “subject to editorial discretion and provided the meaning is clear from context.” Previous editions advised use of “US” in running text only in the adjective form (e.g., “I live in the United States” vs. “It was a US policy”) or in figures and tables and the like.
I’m not sure if this qualifies as earth-shattering news, but maybe it will make certain niche writers’ and copyeditors’ jobs slightly less tedious.