wikipedia
Sǣƿeard is an organization devoted to saving the lives of shipwrecked mariners or people in danger at sea.  In some countries it is part of the military.  In other countries it is a civilian or even volunteer organization.  Most coast guards operate ships and aircraft including helicopters and seaplanes for this purpose.

Coast guards also enforce maritime law, maintain aids to navigation such as beacons and buoys, and provide other services for the benefit of mariners.  Most coast guards are run on military lines and serve as an auxiliary to the national navy.  During wartime coast guards are responsible for harbour defense, port security, naval counterintelligence and coastal patrols.

Þēodliċe sǣƿeardas 

In the United States, the United States Coast Guard is a military service under the United States Department of Homeland Security in peacetime.  In wartime the Coast Guard reports to the Secretary of the Navy but does not become part of the United States Navy; however, its boats and cutters are integrated into U.S. military operations. The U.S. Coast Guard Academy is located in New London, Connecticut. The U.S. Coast Guard Chief Petty Officers Academy is located in Petaluma, California. http://www.uscg.mil/hq/tcpet/cpoa/index.shtm

In Canada, the Canadian Coast Guard is a civilian service under the Department of Fisheries and Oceans.  The Canadian Coast Guard College is located near Sydney, Nova Scotia.

In India, the Indian Coast Guard is a paramilitary unit. It secures the country's coast, carries out rescues, and aids shipping.

In Singapore, the coast guard comes under the command of the Singapore Police Force. Hence, it is called the Police Coast Guard (PCG).

In the United Kingdom coastguard functions are split between four organisations: HM Coastguard deals with rescue co-ordination and carries out land-based rescues, Trinity House and the Northern Lighthouse Board maintain buoys and lighthouses, and the Royal National Lifeboat Institution carries out rescues from the sea, assisted by Royal Air Force, Royal Navy and Coastguard air-sea rescue helicopters when necessary.

Sǣweardas

Australia - two rival privately-run volunteer Coast Guard organizations exist:
Australian Volunteer Coast Guard
Royal Volunteer Coastal Patrol
Canada- Canadian Coast Guard
Greece - Hellenic Coast Guard
Hong Kong - Hong Kong Maritime Rescue Co-ordination Centre
Japan - Japan Coast Guard (ex Maritime Safety Agency)
Philippines - Philippine Coast Guard
Taiwan (Republic of China) - Republic of China Coast Guard
United Kingdom
HM Coastguard
Royal National Lifeboat Institution
United States -  United States Coast Guard

Ūtanwearde bendas
US Sǣweard
RNLI
Þrīneshūs
Guardia Costiera

coast guards Types of military