Which of the following is NOT listed as an Army major weapon system?

The correct answer relates to the classification of weapon systems within the Army. Cyber Warfare is not categorized as a major weapon system in the traditional sense. Instead, it falls under the broader domain of information warfare or cyberspace operations. While cyber capabilities are increasingly recognized for their strategic importance, they do not fit neatly into the conventional weapons system categories that include tangible, physical systems.

In contrast, options like Sustainable Vehicles, Indirect Fires, and Fixed Wing Aviation all pertain to established Army weapon systems. Sustainable Vehicles relate to the Army's efforts to enhance mobility and operational efficiency. Indirect Fires include artillery systems designed to engage targets beyond the line of sight. Fixed Wing Aviation encompasses aircraft used for transport, reconnaissance, and combat support operations. Each of these options represents major capabilities that are integral to the Army's operational effectiveness in a traditional battlefield context.