What brevity term means no ordnance remaining?

The term "Winchester" is the correct answer, as it specifically refers to a situation where no ordnance remains. This military brevity term is commonly used in the context of munitions to clearly and quickly communicate that a unit or individual has expended all their ammunition and cannot engage in further combat activities using ordnance. The origin of this term is thought to be linked to historical firearms made by the Winchester Repeating Arms Company, which were often associated with effective and decisive fire until ammunition ran out.

In contrast, the other terms listed do not relate to the status of ordnance. "Remington," for instance, refers to another manufacturer of firearms and ammunition rather than the current status of ammunition. "Rifle" is a general term for a type of firearm and does not indicate the availability of ammunition. Similarly, "Browning" refers to another firearms manufacturer and player in the arms industry, lacking any relevance to ordnance status. Thus, "Winchester" stands out as the specific term used in military communication for indicating that all ammunition has been used up.