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The Coast Guard was established on Aug. 4, 1790. The Coast Guard is charged with maritime security, safety, and stewardship. While the Coast Guard operates under the Department of Homeland Security during peacetime, during times of war, it can be transferred to the Department of the Navy, as it did in WWI and WWII.
The Coast Guard is comprised of approximately 40,000 active duty personnel supported by an additional 7,000 reservists.