At this point, basically anyone in the infantry that's been a month or two out of OSUT should be able to call for fire. it is a skill level 2 task in the US army, and like Chico posted previously it's universally taught starting at the WLC (PLDC) level (which is the first level NCO course). However, it is taught and drilled into PFC's & SPC's so that they can do it should a team leader go down...
As for what happens when the computers break... Hope people know how to use slide rules as a back up in the FDC because they'll be needed... possibly use pocket calculators too, but that requires some knowledge of how the calculation equations work...
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