Ooh lala. abc me think it was bbc.
The UK had a national service, where men between the ages 17 and 21 were required to serve in the military for 18 months, from 1947 to 1960.
.. in times of sovereign nationhood. First principles should inform every person between 17-21 that we defend out borders, but we don't engage in waging wars abroad. We mind our own business. Today, red team and blue team have no principles.