Don't think the USG won't start trying to enforce its global copyrights.
While in the US, USG works are public domain, outside, they are copyright, under unclear terms (believed all rights reserved) https://en.wikipedia.org/wiki/Copyright_status_of_works_by_the_federal_government_of_the_United_States https://www.cendi.gov/pdf/FAQ_Copyright_30jan18.pdf (see page 17)