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As it takes less than a second to cross 17 KM at .15c, the Maximum Range in vacuum for the GAFM (Fusion Mortar) is listed as 220 000 KM, or the distance it travels in 5 seconds at maximum muzzle velocity.
So, if we round some generous numbers, this mortar can go nearly half way around earth and, in space, travel roughly 4 times the earth's circumference. Is this mortar intended to be some sort of infantry-carried tac-nuke?