Which feature is associated with the AH-1 helicopter?

The correct choice highlights the armament capabilities of the AH-1 helicopter, which is specifically designed as an attack helicopter. The AH-1, particularly in its most modern variants like the AH-1Z Viper, is equipped with an array of advanced weapon systems including missiles (such as the Hellfire), rockets, and a 20mm cannon. This combination of armaments allows for both close air support and anti-armor operations, showcasing the helicopter's primary role in the Marine Corps as a dedicated attack platform.

The other features mentioned in the choices reflect capabilities not primarily associated with the AH-1. While advanced radar tracking is a feature of some military aircraft, it is more specifically aligned with reconnaissance or multi-role systems rather than an attack helicopter's core function. The multi-role capability option suggests versatility across mission types, which is characteristic of aircraft like the UH-1 or other multi-mission helicopters, while the vertical takeoff and landing capability is a general trait shared by many helicopters, including the AH-1, but does not specifically highlight its combat role. The emphasis on armament in the correct choice directly aligns with the AH-1's primary function, differentiating it from other potential helicopter roles.