During the period from 1955 to 1984, logistics research converged around formal optimization techniques applied to distribution networks, fleet sizing, and warehouse location. The era produced systematic algorithms for assignment and transportation problems and introduced powerful heuristics for locating regional warehouses, alongside early vehicle-routing formulations that linked demand satisfaction with efficient routing. Methodological progress blended mathematical programming with practical network design, driving logistics into a quantitatively rigorous, model-based discipline.