In the 1960’s, an infamous memo from the Draft (Selective Service System) described “manpower channelling” as an important part of the draft. Using draft deferments, the system could “channel” young men to behave in ways that were seen as “in the national interest”. Quoting from the memo:
In the Selective Service System, the term “deferment” has been used millions of times to describe the method and means used to attract to the kind of service considered to be the most important, the individuals who were not compelled to do it. The club of induction has been used to drive out of areas considered to be less important to the areas of greater importance in which deferments were given, the individuals who did not or could not participate in activities which were considered essential to the Nation.
… It is in dealing with the other millions of registrants that the System is heavily occupied, developing more effective human beings in the national interest.