` :: By one definition set- a gun is a direct fire weapon barrel aimed close to horizontal, Gun crew direct line of sight to target, range and terrain, main use of M198 is not like that, and the shell is ``lofted`` in trajectory, the definition for a Howitzer. For a Howitzer, a lower propellant/ muzzle velicity can obtain the same or greater range. If necessary due to an imminent close threat an M198 can be used in a gun mode.   `