According to Joint definitions, the On Scene Commander (OSC) is defined as what?

• A. An individual in immediate vicinity of isolating event who temporarily assumes command until rescue forces arrive
• B. An aircraft tasking the target
• C. A unit coordinating airspace
• D. An IP controller

Answer: (A)

The On Scene Commander is the person who is physically at the incident and temporarily takes command to direct the early response until rescue forces arrive and take over. This on-site leadership ensures immediate control, safety, and prioritization of actions while a formal command structure is established. Other descriptions refer to roles that manage air assets or airspace rather than leading on the ground at the scene, so they aren’t the OSC.