What defines a deviation according to standard regulations?

A deviation is defined as a departure from requirements in regulatory documents. This means that any action or circumstance that strays from the guidelines set forth in established procedures is classified as a deviation. Such regulations are critical in maintaining safety and order in operations, particularly in environments where weapon handling and firing are involved.

In the context of the Marine Corps, adherence to these regulations is necessary to ensure the safety of personnel and the integrity of the operational environment. A deviation could involve not following the prescribed safety protocols, which could lead to accidents or unsafe practices during firing exercises.

The other options refer to different aspects of range operations. A change in firing angle pertains to the mechanics of firing, rather than regulatory compliance. A delay in the firing schedule is related to timing and logistics, while an error in ammunition handling concerns safety and operational protocols. While all these elements are important in their own right, they do not encapsulate the concept of a deviation as stipulated in regulations.