Troupes de marine is a fancy way of saying a group of soldiers who fight for the navy. Imagine that the navy needs soldiers to fight on land, like in a battle or war. These soldiers are called troupes de marine, and they are specially trained to fight on land and work together with the navy.
Just like when you play a game with your friends, everyone has a specific job on the team. Troupes de marine soldiers have different jobs too. Some soldiers are really good at shooting guns and they are called marksmen. Other soldiers are really strong and they carry heavy equipment, like artillery.
To become a troupes de marine soldier, you need to go through a lot of training. It's like going to school, but instead of learning about math and reading, you learn about how to be a good soldier. They teach you how to shoot a gun, how to work as a team, and how to stay safe in dangerous situations.
Once you are trained and become a troupes de marine soldier, you might have to go on a mission to protect your country. It's like playing a really big and important game with your friends. You have to work together to win and protect your team.
Overall, troupes de marine soldiers are a special group of soldiers who fight for the navy and are highly trained to work on land. They have different jobs and work together to protect their country.