Further improving the capabilities of aircraft against ships were a variety of precision-guided weapons. Early designs were first used in World War II with manually controlled weapons such as the Fritz X, and evolving into semi-autonomous cruise missiles, such as the Raduga KS-1 Komet, that relied on a combination of initial guidance from the launching aircraft and terminal guidance on the missile itself. These systems allowed the aircraft to launch their attacks from outside the range of shipboard anti-aircraft weapons, in relative safety. Only the presence of defensive fighters operating at long ranges from the ships could provide cover against these attacks, by attacking the launch aircraft before they could close on the ships.