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七十年代初,美国爱格林(Eglin)空军基地的军械研究所建造了价值250万美元的弹道靶道。这是一种封闭的、有仪器的水泥结构室内靶道,用来研究各种自由飞行弹丸的外弹
In the early seventies, the Armory Research Institute at the Eglin Air Force Base in the United States built a $ 2.5 million ballistic track. This is a closed, instrumented cement structural indoor target track used to study the outer shells of various free-flying projectiles