Supply Chain Fluctuation Forecasting Act This bill addresses supply chain forecasting for the Department of Defense (DOD). Under the bill, DOD must specify methods and processes to track and reduce fluctuations in supply chain forecasting and demand requirements. DOD must also implement policies to encourage predictable demand requirements for the following items: clothing and the materials and components thereof; tents (and the structural components thereof), tarpaulins, or covers; any item of individual equipment manufactured from or containing specified fibers, yarns, fabrics, or materials; and hand or measuring tools.