Which feature primarily helps with vehicle maneuverability in tight spaces for the HMMWV?

The feature that primarily aids the High Mobility Multipurpose Wheeled Vehicle's maneuverability in tight spaces is power steering. This system enhances the driver's ability to steer the vehicle with minimal effort, allowing for more agile handling, particularly in confined areas. When navigating narrow passages or making sharp turns, the power steering system provides the necessary assistance to turn the steering wheel easily, which is crucial in maintaining control and precision during maneuvers.

While engine power, turning radius, and the suspension system contribute to the overall driving experience and capability of the HMMWV, they do not directly address the need for ease of steering in tight situations. The turning radius, for example, relates to the sharpness of turns, but without the aid of power steering, achieving those turns in tight spaces would require significantly more physical effort from the driver, potentially reducing vehicle responsiveness. Similarly, while the suspension system impacts the vehicle's handling and stability on various terrains, it does not specifically enhance the ease of maneuvering in narrow areas as power steering does.