When is the mortar to be laid to announce "1 or 0 mil mortar lay"?

The mortar is laid to announce a "1 or 0 mil mortar lay" specifically when the deflection is within 1 or 0 mils. This level of precision is crucial for ensuring that the mortar fire is accurately targeted, as even minor deviations outside this range can significantly affect the impact point of the round.

In mortar operations, the term "mil" refers to the angular measurement used to determine the direction of the target. Achieving a deflection of 1 or 0 mils means that the mortar is being aimed with high precision, enhancing the likelihood of hitting the intended target effectively. The emphasis on such precise measurements underscores the importance of accuracy in artillery operations, where the consequences of a miss can be severe.

Other choices suggest wider ranges of deflection that, while they might still be usable in some scenarios, do not meet the stringent criteria for a "1 or 0 mil mortar lay." The selection of this option demonstrates an understanding of the necessity for accuracy in mortar placements in military operations.