What punctuation mark should end the US national anthem?

The first new player to comment on the website with the correct answer wins a free drink at their next iQ Trivia quiz.
What punctuation mark should end the US national anthem?

The first new player to comment on the website with the correct answer wins a free drink at their next iQ Trivia quiz.
Whole thing? Exclamation mark.
First verse? Question mark.
Well the anthem is the first verse, and that should end with a question mark.
The whole thing is a series of questions.