Question: When did it become a tradition to stand for the national anthem?
Answer: 1942
Disambiguated annotations:
qaPairs: question: When did it become a tradition to stand at attention for the national anthem?
answer: June 22, 1942
question: When did it become a tradition to stand at attention and face in the direction of the music for the national anthem?
answer: December 23, 1942
question: When did it become a tradition to stand for the national anthem, with hand over the heart and removing hat?
answer: July 7, 1976