Air Force Handbook Practice Test

The main idea is who keeps sea routes open and safe when ice is present. The Coast Guard is tasked with maritime safety, security, and stewardship, and that includes operating and maintaining icebreakers to break through ice, clear navigational channels, and assist vessels so they can sail safely in icy waters. The other branches have different primary missions: the Navy focuses on national defense and combat operations, the Marine Corps on expeditionary warfare, and the Army Corps of Engineers handles civil works like harbor construction and inland waterway projects. While the Corps may support navigation-related infrastructure, the explicit duty to provide icebreaking services for maritime safety sits with the Coast Guard.