In addition to this being the U. S. Army’s 244th Birthday – https://upsdownsfamilyhistory.wordpress.com/2019/06/14/happy-244th-birthday-u-s-army, it is also the 242th National Flag Day in the U. S. – https://en.wikipedia.org/wiki/Flag_Day_(United_States).
YouTube Flag Day video: https://www.youtube.com/watch?v=2cwMmKdRcKY (around 3:09 minutes long)
For Flag Days in other countries, here’s what Wikipedia indicates https://en.wikipedia.org/wiki/Flag_Day.
Other countries celebrating Flag Day or a similar day in June are
- Argentina (June 20)
- Denmark (June 15 – tomorrow)
- Estonia (June 4)
- Finland (June 22, but varies from year to year) and for other flag days – https://en.wikipedia.org/wiki/Flag_days_in_Finland
- Peru (June 7)
- Romania (June 26)
- Sweden (June 6)