What category describes resources whose loss would cause unacceptable mission degradation?

The category that describes resources whose loss would cause unacceptable mission degradation is referred to as PL1. This classification is used within the context of critical mission resources, emphasizing the level of impact on operational readiness and mission success.

PL1 resources are essential for the execution of critical missions and their loss could significantly hinder operational capabilities. This includes specific weapon systems, key personnel, or critical infrastructure that, if compromised, would directly impair mission success or operational effectiveness.

In contrast, other categories, such as PL2, PL3, and PL4, represent tiers of resources with decreasing critical importance. PL2 resources, while important, would have a lower impact on mission success compared to PL1. PL3 and PL4 further signify categories that deal with less critical operations or non-essential resources, where the loss may result in manageable or acceptable impacts on the mission.