What is a file in military terms?

In military terms, a file refers to a specific formation where elements are arranged in a straight line one behind the other, which gives a front of only one element. This formation is typically used for movement or when units need to control their spacing and maintain silence during operations, as it minimizes the profile and makes it easier to navigate through narrow areas. This arrangement allows for a more controlled progression and is useful in certain tactical situations where visibility and direct engagement need to be minimized.

The other choices describe different concepts in military formations and tactics. For instance, a formation with multiple elements typically refers to a line or a column that has a wider front, and a tactical movement usually involves maneuvering units in a coordinated manner, which is distinct from the simple arrangement of a file. A communication signal in formation refers to how units communicate while positioned, but does not pertain to the structural definition of a file.