NASA has made a significant progress in Mars missions since my last visit to KASI in June 2015. In this talk, I will discuss what NASA has accomplished last one year and how much NASA is ready for human missions to Mars. As a proposer of NASA human landing site on the surface of Mars, I will go over the criteria that NASA uses to determine or finalize the human landing site using my proposed site Gale Crater as an example. I will close my talk by examining the impact of NASA Mars missions on science, technology, engineering, STEM education, and economy as well as the significance of human presence on Mars to our future generations.