How William's New Job Will Affect Kate, George, and the Royal Family

There is no law against members of the royal family holding down "civilian" jobs, however, the tradition has been that male members of the direct line of succession are expected to either focus on a military career or work on philanthropy. This means that William is the first immediate heir to the throne to sign onto a civilian position, and it's a major step in the direction of modernization for the royal family.