Who is the federal SAR coordinator for all inland SAR operations?

The U.S. Air Force serves as the federal SAR coordinator for all inland SAR operations due to its established structure and expertise in conducting search and rescue missions across various terrains and conditions. This designation arises from the Air Force's responsibility under the National Search and Rescue Plan, which aligns military capabilities with civilian search and rescue efforts.

The U.S. Coast Guard is primarily responsible for maritime SAR operations, focusing on search and rescue activities in coastal and offshore waters. The Federal Aviation Administration oversees aviation safety and regulations but does not coordinate SAR operations directly. The Department of Homeland Security plays a broader role in national security and emergency management but does not specifically act as the SAR coordinator for inland operations. Thus, the U.S. Air Force's unique role and capabilities in conducting inland SAR missions make it the correct answer.