Which of the following is NOT a standard command given in rifle drills?

The selection "Stand Down" is not a standard command given in rifle drills. In military drill and ceremony, commands are specifically designed to achieve certain postures or actions that align with the protocols of handling a rifle. "Rest Arms," "Order Arms," and "Attention" are all traditional commands that direct Marines on how to hold their rifles and maintain proper posture during drills.

"Rest Arms" is a command used to instruct Marines to hold their rifles in a less formal position while still maintaining a level of readiness. "Order Arms" is a command that requires Marines to place their rifles in a position of carry. "Attention" is a command that demands Marines to stand straight and alert while keeping the rifle in a position of readiness. These commands are integral to maintaining discipline and uniformity during drills.

In contrast, "Stand Down" is not recognized as a standard command for rifle drills. Instead, it typically pertains to an order that signals the completion of a task or allows personnel to relax from a state of readiness. Therefore, it does not fit within the context of rifle drill commands, which are more focused on positioning and use of the rifle.