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The class of supplies that includes construction equipment, fortifications, and barriers is classified as Class 4. This category encompasses items necessary for the construction and maintenance of facilities and infrastructure, which is critical for military operations. It specifically includes materials like cement, lumber, and various types of equipment that are essential for building fortifications and barriers to secure operational areas.

In the context of the military supply system, Class 4 supports the logistical needs of construction and tactical fortification, focusing on ensuring that forces can establish defensive positions and maintain field operations. Understanding this classification is vital for effective supply chain management in military contexts.