What type of missile is the SM-2?

The SM-2 missile is categorized as a semi-active missile. This means that it relies on onboard guidance for trajectory adjustments after being launched, while also depending on an external target tracking source to illuminate the target during the engagement.

In the case of the SM-2, the missile is typically guided by radar systems from the launching ship or an associated platform that provides continuous tracking of the target. This allows for more accurate targeting compared to purely active or passive missiles. Active missiles are equipped with their own guidance system, seeking targets without external assistance, while passive missiles rely solely on the target's emissions for guidance. Electro-optical missiles use visual or infrared imaging systems for guidance, which is not the case for the SM-2.