When responding to an American Red Cross emergency notification, who should be notified?

In the context of responding to an American Red Cross emergency notification, the appropriate action is to notify the Command Duty Officer (CDO) or Chaplain. This choice is correct because the CDO is typically responsible for overseeing ship operations and ensuring that appropriate protocols are followed in emergency situations. The Chaplain can provide support and assistance to the service member and their family during crises.

Notifying just the service member directly does not account for the broader organizational response needed; it may not ensure that all necessary support mechanisms are activated. Additionally, informing only the duty officer would not adequately involve the chain of command or the emotional and spiritual support that a Chaplain can provide. Lastly, alerting all personnel on board might not be necessary and could lead to unnecessary alarm or confusion. The focus should be on establishing a structured response through the proper channels, which is why informing the CDO or Chaplain is the most effective course of action.