Medical: Injuries in a disaster can easily become infected and have very serious consequences.
If we train in some basic first aid, and some advanced topics, we may be able to care for our neighbor (or they care for you) and stabilize their condition until a qualified medical professional is available. In a long term situation, we may have to able to protect and monitor that injury so we can continue to manage tasks, like keeping a garden for food.
Every American should be trained to at least Combat Lifesaver level to provide immediate care for victims of severe trauma, whether it be a car accident, a gunshot wound, a chainsaw accident, etc. to save lives.
Our second level is EMT, and third level is medic/paramedic.