This guide details the expert-level procedure for calibrating and laying the M29 81mm Mortar, as demonstrated in a 1962 U.S. Army training film. It emphasizes precise sight calibration using the M34A2 Sight Unit and M19 Boresight, achieving an 800 mil elevation standard. The process involves establishing aiming points and reference lines with an aiming circle and posts to ensure parallel mortar barrel alignment for accurate fire missions. The instruction highlights the importance of geometric principles and disciplined execution for effective mortar operations.
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