Marine

Marine is an umbrella term for things relating to the ocean, as with Marine biology, Marine geology, and as a term for a navy, etc. In scientific contexts, the term almost always refers exclusively to saltwater environments, although in other contexts (e.g., engineering) it may refer to any (usually navigable) body of water.

Science fiction marines

• Space Marines
• United States Colonial Marines
• Marines are the basic military unit for Terrans in Starcraft.
• The Mobile Infantry in Heinlein's Starship Troopers could be considered and are intentionally patterned after Marines.