The M67 sight unit must be turned in when the elevation is not within how many mils tolerance?

The M67 sight unit is a critical component for ensuring accurate targeting with mortars. It has specific tolerances that must be maintained for effective operation. The correct threshold for when a sight unit must be turned in is when the elevation is not within 20 mils of the correct setting. This 20 mils tolerance ensures that the sight remains reliable and accurate for firing, as deviations beyond this range could lead to significant targeting errors during operations. Effective communication of this standard is essential for maintaining the integrity of mortar operations and ensuring soldier safety as well as mission success.