Which agency collaborates closely with HFD during major disasters?

The Office of Emergency Management (OEM) is the correct answer because it plays a critical role in coordinating disaster response efforts, including those involving the Houston Fire Department. During major disasters, the OEM ensures that multiple agencies work together effectively to manage the situation. This includes establishing communication channels, resource allocation, and logistical support for first responders, including firefighters.

The OEM's responsibilities include planning for emergencies, providing training, and ensuring that all stakeholders are prepared to respond to natural and man-made disasters. By collaborating with HFD, the OEM helps to streamline efforts and improve coordination, ultimately enhancing public safety and disaster resilience in the community.

Other agencies mentioned may play important roles in specific scenarios, but the OEM is specifically tasked with managing emergency responses and facilitating collaboration among various agencies during major events.