As citizens of this country to which we both contribute and take, in my opinion there is nothing wrong. We too were students of Rabbi Newhouse’s Z”L Bais Yakov and we did pledge each afternoon and sang the national anthem. It would be nice if todays children would know the words to the pledge and national anthem. One never knows when joining in such will show a Kiddush Hashem.
When one goes to obtain citizenship it is a requirement!