36 U.S. Code § 301 - National anthem
2008—Subsec. (b)(1)(A) to (C). Pub. L. 110–417 added subpars. (A) to (C) and struck out former subpars. (A) to (C) which read as follows:
“(A) all present except those in uniform should stand at attention facing the flag with the right hand over the heart;
“(B) men not in uniform should remove their headdress with their right hand and hold the headdress at the left shoulder, the hand being over the heart; and
“(C) individuals in uniform should give the military salute at the first note of the anthem and maintain that position until the last note; and”.