We have already sent probes to the moon,mars,venus, one on the way to pluto now,and numerous other ones throughout NASA's history,not to mention landing men on the moon. The PRC is way behind us but we need to stay sharp and keep our lead over everyone.
However, NASA still hasn't confirmed whether or not their is accessible water on the Moon; they haven't settled on a suitable site for a base; and they haven't found out whether the entire Moon is covered in clingy dust, or whether there are less dusty places. Also, the amount of radiation that hits the surface.