The number of ex-servicepersons in the US is 18 million, or 7% of the adult population. In the House of Representatives, it is 18%, and it is 19% in the Senate. While vastly overrepresented, this is a far cry from the 1965-1975 period when it was 70% in both chambers and peaked at 80% in the Senate in 1975. Why? – the end of the draft and a shrinking army.