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... DoD, NATO) Any straight line to which the fall of shot of projectiles is related or fire is adjusted by an observer or a spotter. See also gun-target line; observer-target line.

... 30 calibers; however, the tube length can exceed 30 calibers and still be considered a howitzer when the high angle fire zoning solution permits range overlap between charges. See also gun; mortar.(DoD) A cannon that combines certain characteristics of guns and mortars. The howitzer delivers projectiles with medium velocities, either by low or high trajectories.