Every year the US Army, operating in 146 countries around the world, has to convince 80,000 young people to join its ranks. In order to recruit, in the absence of military service, it has set up a very sophisticated program in schools to enroll thousands of teenagers: the JROTC or junior military reserves. This program concerns more than 3000 public schools, and nearly 500,000 teenagers aged between 14 and 18.