The Marine Corps is tasked with which Department of the Navy (DON) functions?

The Marine Corps is primarily tasked with amphibious operations as part of its core mission, which involves deploying and conducting operations from the sea in support of land forces. This function is crucial to the overall strategy of the Navy and plays into the United States' capability to project power across various domains.

However, while maritime security and anti-piracy, as well as search and rescue operations, are important roles within the larger context of Navy operations, they are not specifically designated as Marine Corps functions. The Marine Corps does conduct a range of operations that might overlap with these areas under certain circumstances, but their primary charter centers on the expeditionary assistance and force projection through amphibious assault and operations.

The other choices in the question reflect responsibilities more aligned with broader Navy missions or other Department of Defense branches. This context helps clarify why none of those specific functions are uniquely tasked to the Marine Corps as its primary mission within the Department of the Navy.