The crossword solution for the term 'Uncle Who 'Wants You!' is SAM, which stands for Selective Service Act of 1948. This act was a United States federal law that required all men between the ages of 18 and 25 to register with the Selective Service System for a potential future draft into the military. The phrase 'Uncle Who 'Wants You!'' is a reference to the U.S. government's call to action for young men to register for the draft.