I may have to take exception with this comment
Although my memory is fading a bit, I can remember that ham radio augmented 9-11 communications for a few days. The towers contained NYFD repeaters and cell phone sites. Hams were being used to relay messages for the FD for a short time.
One I do remember more clearly. When Hurricane Maria hit Puerto Rico, hams were the only communications for awhile. Hams were relaying police and fire calls for a week while public service radio was down:
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Ham radio operators are saving Puerto Rico one transmission at a time | CNN
When Hurricane Maria knocked out power and phone services, volunteer "ham" radio operators lept into action to support rescue and recovery communications.www.cnn.com
Take exception all you want. I was there...on the ground, in Puerto Rico, in a disaster recovery role for a federal agency. That article, which the ARRL and others cite regularly, is an exaggeration at best. What the hams did was augment communications for the Red Cross and the like. They were not handling first responder traffic, nor were the first responder "networks" down. Where a repeater or two might have gone down and the backup generators didn't kick in, simplex/talkaround was used effectively until they were brought back online, very quickly. Public service radio was not down for a week or anywhere close to that. Absolutely ridiculous claim.