A week after the fact, the Lord of the Ring Dings is still getting a lot of criticism over this. When I started in my current profession some 30 years ago, my first supervisor was a retired lieutenant colonel (spelling?) from the Army. There was a question about the flag flying at half staff and he said there is a definite protocol for it.
There may be in the military, but there's no established one I could find for the whole US.
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