上世纪七八十年代,诞生了一大批坦克装甲车辆、炮兵武器和武装直升机等“金属密集型”装备,如美国 M1系列坦克、M2系列战车、“爱国者”防空导弹、“阿帕奇”武装直升机．俄罗斯 T-72坦克、“冰雹”多管火箭炮、“米- 28”直升机,欧洲“挑战者2”、“勒克莱尔”、“豹2”主战坦克等。它们目前仍是各国陆军的主战装备,并计划经过现代化改造后再服役20～30年。 In the seventies and eighties of the last century, a large number of “metal-intensive” equipment such as the M1 tank, the M2 series tanks, the Patriot anti-aircraft missiles, and the “Apache” “military helicopter. Russia T-72 tanks, ”Hail“ multi-barrel rocket, ”Mi-28“ helicopters, European ”Challenger 2“, ”Leclerr“, ”Leopard 2" main battle tanks and so on. They are still the main battlefield equipment of the armed forces of various countries and are planned to serve for 20 to 30 years after being modernized.