Which aircraft's primary function is to attack and destroy surface targets under day and night visual conditions?

The AV-8B Harrier is primarily designed for ground attack missions, excelling in its ability to engage and destroy surface targets during both day and night visual conditions. This capability stems from its unique vertical takeoff and landing features, which allow it to operate in a wider variety of environments, including confined spaces that would not support other aircraft. The Harrier is equipped with a range of precision-guided munitions, as well as a cannon, making it adept at striking enemy positions effectively.

In contrast, while the F-18 Hornet also has multirole capabilities including ground attack, it is not singularly focused on that role as the AV-8B is. The EA-6B Prowler serves electronic warfare roles rather than direct attack functions. The CH-53E Sea Stallion, primarily a heavy lift helicopter, is focused on transport and troop movement rather than direct engagement of surface targets. Thus, the AV-8B Harrier stands out in this context for its specific mission profile.