Millennials have seen the consequences when peacekeepers do nothing, as in Rwanda. We have seen the breakdown of states along religious and ethnic lines, as in the former Yugoslavia. Perhaps the so-called war on terror has made some of us cynical or hesitant to involve ourselves in trouble and turmoil that seems far removed. But I also see a spirit of optimism and responsibility among millennials that might enable us to take up the challenge for peace that the government has largely avoided.