Which feature directly contributes to the JLTV's reduced maintenance requirements?

The feature that directly contributes to the JLTV's reduced maintenance requirements is streamlined component access. This design approach ensures that maintenance personnel can easily reach critical components of the vehicle, allowing for quicker inspections, repairs, and parts replacements. By minimizing the complexity and time involved in accessing various systems, the JLTV can experience faster turnaround times for maintenance tasks. This ultimately leads to improved operational readiness and reduced lifecycle costs for the vehicle.

The other options, while beneficial, do not specifically relate to maintenance efficiency. Advanced combat technology enhances the vehicle’s operational capabilities, increased engine capacity may improve performance but doesn't facilitate maintenance, and dual-purpose functionality refers to the vehicle's ability to serve multiple roles but does not affect how easily maintenance can be performed. Streamlined access to components is a key factor in making upkeep more manageable and less time-consuming, which is why it is the correct answer.