Answer:
Military recruitment.
Explanation:
Recruitment was, during the time of the world wars, one of the main ways in which the armies reinforced their ranks, given the need to have huge numbers of troops to be able to cope with the war efforts.
In short, recruitment was a type of catchmentof military personnel by which the armies, through lotteries or other types of random methods, selected young people who had to join the armed forces to appear in battle.
