Final answer:
The correct emergency response type is Explosive Ordnance Disposal (EOD), which deals with handling and disposal of explosive devices.
Step-by-step explanation:
The emergency response type in question where the EOD (Explosive Ordnance Disposal) leader determined it was necessary to transport an item to a secure location and destroy it by detonation is clearly identified as Explosive Ordnance Disposal (EOD). This type of response involves the detection, identification, evaluation, render safe, recovery, and disposal of explosive ordnance that pose a threat. It is distinct from other emergency services, such as Emergency Medical Services (EMS), Hazardous Materials (HazMat), and Urban Search and Rescue (USAR), which do not deal specifically with the transport and destruction of ordnance.