The National Defense Act of 1916 allows the use of the National Guard for which of the following purposes?

The National Defense Act of 1916 establishes the framework for the use of the National Guard, allowing its deployment during emergencies to support civil authorities. One of the primary functions of the National Guard is to assist in response efforts during natural disasters, such as hurricanes or floods, where state and local resources may be overwhelmed. This involvement includes search and rescue operations, providing medical assistance, and helping restore order and public safety.

Additionally, this act permits the National Guard to enforce federal laws during emergencies, especially when local law enforcement capabilities are strained or when civil unrest poses a threat to public safety. This dual-role capacity highlights the Guard's significance in both state and federal missions, reflecting its flexibility in addressing various challenges that may arise in times of crisis.

In summary, the correct answer encompasses the broad role of the National Guard as a vital resource for states in responding to natural disasters and ensuring compliance with federal laws, thereby underscoring its essential function in the framework of emergency response and civil support.