What type of surface-to-air missile (SAM) is characterized by its mobility and smaller missile engagement system?

The correct choice emphasizes the defining features of tactical surface-to-air missiles (SAMs), which are designed for quick deployment and mobility to respond to immediate threats on the battlefield. Tactical SAM systems typically comprise lightweight launch platforms that can be easily transported and relocated. Their design focuses on engaging relatively low-flying aircraft and often includes features that allow for rapid targeting and firing.

Unlike strategic SAMs, which are generally fixed installations intended for long-range engagements and air defense of larger areas, tactical SAMs operate with a much more flexible approach suited for diverse combat scenarios. The smaller missile engagement system associated with tactical SAMs allows for easier integration with various platforms, including vehicles, ships, and helicopters, making them versatile in different operational contexts.

On the other hand, active radar missiles and infrared missiles refer to specific guidance systems used within broader missile categories, without a direct correlation to mobility or engagement systems. Thus, they do not capture the essence of the question as effectively as tactical SAMs do. Overall, the adaptability and lighter profile of tactical SAMs are what make them the optimal choice in this context.