Due to the simultaneous decline in Vietnam War military spending, the slowing of the space program as Project Apollo neared completion, the recession of 1969-1970, and Boeing's $2 billion in debt as it built the 747 airliner, the company and the Seattle area greatly suffered. Commercial Airplane Group, by far the largest unit of Boeing, went from 83,700 employees in 1968 to 20,750 in 1971. Each unemployed Boeing employee cost at least one other job, and unemployment rose to 14%, the highest in the United States. Housing vacancy rates rose to 16% from 1% in 1967. U-Haul dealerships ran out of trailers because so many people moved out. A billboard appeared near the airport: