What do we call a line of Marines or vehicles placed side by side?

The correct term for a line of Marines or vehicles placed side by side is known as a "rank." In military terminology, a rank refers to the horizontal arrangement of personnel or units across a formation. This organization allows for effective maneuvering and adherence to military protocols during drills, parades, and other formations, where visibility and command structure are essential.

Understanding the concept of rank is vital for recognizing how units are deployed in various formations and the importance of maintaining order and discipline within the ranks. For instance, in a traditional setting, Marines stand in ranks during ceremonial events, which emphasizes the importance of unity and cohesion within the unit.