Providing forces for maritime search and rescue, icebreaking, and servicing of maritime aids to navigation is a specific wartime function of which military service?

I believe the answer is: The coast guard.

The main duty of the coast guard is to maintain maritime law on both united states' sea and foreign territory.

They are the first line of help that would move in case there is an accidents on vehicles on the sea and they possess all the necessary war vehicles as the first line of defense in case there is an invasion that came through the sea border.

answer; fair labor and standard act;

yes he did writing dots to make the answer