Which of the following is NOT a USAF major weapon system?

The correct answer highlights that cruise ships do not fit into the category of major weapon systems for the United States Air Force (USAF). Major weapon systems are typically defined as those platforms specifically designed to deliver combat capabilities, which include various types of aircraft.

Bomber aircraft, for instance, are a critical part of the USAF's strategic capabilities, designed for long-range strike missions. Electromagnetic attack aircraft are included within the purview of contemporary warfare as they utilize advanced technology to engage or disrupt enemy systems electronically. Aerial refueling aircraft play a vital role in extending the operational range and endurance of combat aircraft, enabling sustained air operations.

On the other hand, cruise ships do not possess any military capabilities and are not utilized by the USAF for defense or combat purposes. They are considered civilian vessels and do not contribute to the USAF's mission sets, which focus on air superiority, global strike, rapid global mobility, intelligence, surveillance, and reconnaissance. Hence, identifying cruise ships as not being part of the USAF's major weapon systems is accurate.