Telecommunications services that are used to maintain a state of readiness or to respond to and manage any event or crisis (local, national, or international), which causes or could cause injury or harm to the population, damage to or loss of property, or degrades or threatens the NSEP posture of the United States.
Sources:
CNSSI 4009-2022
from
47 C.F.R., Part 64 Appendix A - adapted