The merchant navy was and is the cargo ships of any country. In WW2 they were often armed or had a fighter aircraft.
The Royal Australian Navy had the Fifth largest navy in the world at the begginning of World War 2.
The American Navy
The Atlantic Star was awarded to crews of the Royal Navy or the Merchant Navy for service during World War 2. It was awarded to a crew who served in the Atlantic operationally for at least 6 months.
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Merchant Marine Liberty ships
During World War 2 about 1.5 million Scottish men volunteered to fight. This includes members of the British Army Navy and Air Force as well as the Merchant Navy. These were composed of: The British Army - 804000 men The Royal Navy - 147000 men The Royal Air Force - 197000 men The Merchant Navy - 40000 menIn addition to these volunteers there were also many Scottish men who fought in the Home Guard the Royal Artillery and other auxiliary forces bringing the total amount of volunteers to 1.5 million.
To help the Navy men with ships and supplies and duties to win the war
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The USN.
Kreigsmarine
Kriegsmarine
There are mainly three ways to join merchant navy: 1. marine engineering 2. nautical science 3. crew rating