American National Red Cross:

Ham radio is a vital part of the Red Cross and many local chapters have teams of hams ready to assist them in disaster and emergency response. While the Red Cross has its own nationally licensed VHF public safety frequency, it uses hams to take the load off that channel and give it much greater range during disasters. For those very reasons, ham radio and the Red Cross go well together. In 2017, 50 hams from the mainland United States were deployed to Puerto Rico to help set up communications networks after the island sustained heavy damage from Hurricane Maria.

ARRL & American Red Cross Memorandum of Understanding (MOU) PDF