http://www.americanvolunteerreserve.org/regulation/Army/r600_25.pdf
110. Foreign national anthems. [...] The same honors rendered to the United States National Anthem will be rendered during the playing of the foreign national anthems.
As less and less people join the military, I guess blind spots like this will pop up.
Find one that was in affect when the original usurper gave the order...then you've got somethin.