FM-3-09 Fire Support and Field Artillery Operations Download
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Field Artillery Operations 30 April 2020 FM 3-09 4-15 OBSERVED FIRE AND UNOBSERVED FIRE 4-85. Fires are either observed or unobserved. Observed fire is the point of projectile impact or burst that can be seen by an observer, and can be adjusted on the basis of observation. 4-86. Unobserved fire are projectile points of impact or burst not observed. The observer can attempt to adjust the round based on the sound of the impact.