Which of the following is NOT one of the four positions of rest?

The correct choice, which is "Stand Still," is not recognized as one of the four positions of rest in military drill and ceremonies. The four established positions of rest include Parade Rest, At Ease, Fall In, and Fall Out. Each of these positions has specific guidelines for when and how they are used during formations.

Parade Rest allows personnel to relax while maintaining a formal posture, and it reflects a position of readiness. At Ease permits greater freedom while still requiring individuals to remain in place and attentive. Fall Out, on the other hand, signifies that members are released from formation for a specified period while still being expected to return to order.

Understanding these distinctions is critical for maintaining military discipline and cohesion during various events and ceremonies. This knowledge ensures that personnel can respond appropriately to commands and maintain the necessary level of professionalism expected in the U.S. Marine Corps.