To insure the forward projection of sea power.
England has the Her Majesty's Royal Marines. They have the same function as the US Marines. Most countries with a navy have a marine equivalent.
Marines are usually fighting in the sea, so if there were no marines, then there would be more attack's from other countries who came by using the sea.
Yes, the Royal Marines do accept soldiers from other countries under certain circumstances. Non-British citizens may join the Royal Marines if they have lived in the UK for a certain period of time, meet the necessary residency requirements, and have the required immigration status. Additionally, individuals from certain Commonwealth countries may also be eligible to join the Royal Marines.
Generally you need a degree.
Many have Marines.... not a whole corps worth, though. In some countries, they're referred to as Naval Infantry.
You need a high school diploma.
A high School diploma.
maybe
You'll need to get that treated first.
Hawaii
High-school Diploma
marines guard the president because they need to protect him from being hurt or killed they make marines do it because former presidents john f kennedy and abraham lincoln got shot and were not protected