During the command to MAKE READY, what must be ensured?

During the command to MAKE READY, it is essential to ensure that the weapon is in Condition 1. Condition 1 for the M16A3 and M4A1 rifles means that the magazine is inserted, a round is chambered, and the weapon is on safe. This condition allows the rifle to be immediately ready for use while still maintaining safety measures, as the weapon remains in the safe position until it is required to fire.

This readiness is critical in combat situations where immediate action may be necessary. Ensuring Condition 1 provides the operator with a balance between readiness and safety, allowing them to respond quickly while still adhering to safety protocols.

The other choices relate to different safety or preparation checks but do not align with the specific requirement of being in a ready condition during this command. For instance, having an empty chamber or removing the magazine would render the weapon unusable at that moment, which contradicts the purpose of the MAKE READY command.