Independence Day Morning Riddle

I’m thrown down by a ref for a rule violation;
I cut notes in half when in music notation;
Tag message board posts that will need moderation;
And wave me today to show pride in our nation!

Who am I?

UPDATE: Riddle solved by Rebecca. See comments for answer.

2 Responses to “Independence Day Morning Riddle”

  1. Rebecca Says:

    Flag!

  2. Bill Says:

    FLAG is correct. Happy Independence Day, Rebecca!

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