Honking Twice
In the arm forces, honking two times to warn other people that you are backing up is a common practice. Soldiers that are back from service have the tendency to do this out of sheer habit.
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The Flag
The American nation is represented by the American flag, so the flag deserves a lot of respect. When soldiers see the flag being raised, they will stand immediately, and at times, salute. Nobody’s taking a knee here.