Prince William is launching a five-year project to end long-term homelessness in the United Kingdom. He says he wants to make sure that instances of people being left without a roof over their heads are “rare, brief and unrepeated.” The heir to the throne will announce details of the program over the next two days as he visits six pilot projects around the country that have received grants each of up to 500,000 pounds, or about $637,000, from the Royal Foundation, the charity that supports the work of William and his wife. The prince said tackling homelessness has been important issue for him since he visited a shelter with his mother, Princess Diana, as a schoolboy.