On World AIDS Day, we remember those who have lost their lives to AIDS, and we recommit ourselves to fighting and preventing HIV/AIDS and to comforting those infected and their loved ones. The United States is working with its partners around the world to turn the tide against HIV/AIDS.On this World AIDS Day 2015, imagine if we had everything we need — the tools, science, and shared goals — to reduce by 90 percent the number of women, men, and children newly infected by HIV. Imagine the creation of an AIDS-free generation that eliminates HIV as a public health threat and where no one is left behind. Such a future, once inconceivable, is now possible. But we must seize the opportunity to reach it.Today, we invite and challenge host government leaders, scientists, civil society, faith-based organizations, and the private sector to all join together in solidarity to finally bring this unrelenting epidemic to a halt. We can create an AIDS-free generation where no one is left behind. But we must continue working together to make it happen. The Time to Act Is Now!