Playing a patriotic "hymn" at sporting events is rather ridiculous, unless you consider stadiums to be the equivalent of a church. End the practice of forced patriotism already. Much ado dumped on Kapernick for no good reason. 
BTW, can you name a war(s) where an American soldier(I am assuming that is what you meant by "people") died to guarantee me or anyone else our civil rights? Off the top of my head, the only ones that remotely qualify would be the Civil War( to free black slaves), and the Revolutionary War (had it been lost maybe we'd still be subject to British rule, horrible that thought, eh?). Any gain or loss of civil rights we've sustained to this point hasn't required anyone in uniform to die(excepting the aforementioned conflicts) that I'm aware of.