Firstly, I am British, so I have 0 clue on how the US armed forces work.
My limited knowledge of the system tells me that marines and the army perform the same task, which is the primary land based attack force.
So what exactly is the difference between the 2 and how does the US decide which force to mobilise and when?
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Marines are a quick reaction small scale amphibious capable force and can be deployed anywhere in the world in 24 hours. Army is basically a large scale occupational ground force. As far as combat operations go, they have similar capabilities and missions although army typically has more resources available to them. Marines hitch rides on navy ships to places around the world and army typically flies in. If you need a force to assault a city and drive out enemy fighters you call the marines, if you need a force to maintain a long term hold on that city and repel attacks you call the army.
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