The US replacement for Corporal was the Sergeant. Sergeant was solid-fuelled and generally comparable to Blue Water, although it was more complex and slower to operate and, like Corporal, still required a train of semi-trailer vehicles. It was however promised for delivery in 1961. In 1960 West Germany agreed to buy Sergeant rather than to wait for Blue Water. As this represented the other major customer for Blue Water, and also the likelihood that other potential customers such as Turkey and Italy would then follow this American path, the sales prospects for Blue Water became bleak.