The Chinese Ordnance Society has published a popular-science article systematically reviewing how 3D printing is used to support equipment on the battlefield. The article notes that forward-deployed additive manufacturing systems can move parts production from rear factories to frontline bases, ships, and even field tents, cutting replacement-part lead times from weeks to hours. The U.S. military used 3D printing in Afghanistan to make replacement parts for drones, reducing repair time from weeks to a few hours. Technically, the article distinguishes three types of forward-deployed systems: portable 3D printers that use plastic and resin to print tool handles, fixtures, and seals; metal 3D printers that use processes such as laser powder bed fusion and electron beam melting to make key aerospace and defense components from high-strength metals including titanium alloys, aluminum alloys, and stainless steel, and that are usually deployed at frontline bases or on ships because of their larger size; and multi-material 3D printers that can print metals and plastics, or rigid and flexible materials, at the same time. Containerized mobile factories integrate printers, post-processing equipment, and material storage into standard shipping containers that can be transported by truck, train, or ship and rapidly set up. The article explicitly notes that 3D printing requires dedicated raw materials such as metal powders and resins, and that the supply chains for these materials must also be secured. It also points out that the range of high-performance materials currently available for 3D printing is limited, that printing processes for special alloys and composites are not yet mature, and that printed parts usually require post-processing such as heat treatment, surface treatment, and machining. The quality consistency and reliability of critical load-bearing components must undergo rigorous certification.