A prototype ROTHR system was installed on the isolated Aleutian Island of Amchitka, Alaska, monitoring the eastern coast of Russia, in 1991 and used until 1993.
ROTHR系统原型安装在阿拉斯加阿留申群岛的安奇卡岛上，监视俄罗斯东海岸，1991年用到1993年。