The 638 Supply Chain Management Group (SCMG) is a specialized unit within the U.S. Air Force (AFMC). Its primary function is to manage and oversee supply chain activities, ensuring efficient and effective distribution of resources across various AFMC missions. This includes inventory management, logistics support, transportation, and contracting services. The group operates under the Air Mobility Command, playing a critical role in the readiness and sustainment of U.S. Air Force operations globally.