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The 4th paragraph refers to the "U.S. Code of Ethics", which I'm pretty sure should be the "United States Code". The quotation appears to be 36 USC 142; if so, the citation is incompletely stated. The link in the Notes section is OK (except for formatting). An alternate link would be to the Office of the Law Revision Counsel, U.S. House of Representatives; that URI is 
TITLE 36 - PATRIOTIC AND NATIONAL OBSERVANCES, CEREMONIES, AND ORGANIZATIONS Subtitle I - Patriotic and National Observances and Ceremonies Part A - Observances and Ceremonies CHAPTER 1 - PATRIOTIC AND NATIONAL OBSERVANCES Sec. 124. National Freedom Day