In the USA, before TV was on 24 hours, there was a nightly sign off where the Star-Spangled Banner was played while some American imagery such as the American flag was shown before the TV cut to static. – WTF Fun Facts
Source: https://www.nytimes.com/2019/10/30/arts/television/national-anthem-tv.html
@ R Brown. *Native American
I remember this happening when I was very young. The national Anthem was played and afterward was a test pattern with an Indian wearing a head dress.