In what year did the JLTV program reach full rate production?

The Joint Light Tactical Vehicle (JLTV) program reached full rate production in 2019. This milestone is significant as it indicates that the vehicle had undergone rigorous testing and validation processes, demonstrating that it met all performance, safety, and operational requirements set by the military. Achieving full rate production means that the manufacturing process was fully operational, allowing the military to begin receiving JLTVs at scale to replace older tactical vehicles. This transition is critical for enhancing the mobility and survivability of troops in the field, aligning with the overall goals of modernization and readiness within the armed forces.

The other years mentioned do not reflect this milestone. For instance, 2018 marked the initial production phase, and 2020 and 2021 are beyond the time the program had fully transitioned to production. Hence, the selected answer accurately captures the key moment in the JLTV program's timeline.