The one-platoon system, also known as iron man football, was a system in American football where players played on both offense and defense. It was the result of rules that limited player substitutions, rules that are also standard procedure in many other sports, but were eliminated in the 1940s. The alternative system is known as the "two-platoon system", or simply the "platoon system", because of its use of separate offensive and defensive units. Each system was used at different times in American college football and in the National Football League.
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“As long as learning is connected with earning, as long as certain jobs can only be reached through exams, so long must we take this examination system seriously. If another ladder to employment was contrived, much so-called education would disappear, and no one would be a penny the stupider.”
—E.M. (Edward Morgan)