Crack Thump training sounds like it would be interesting... I've only come close twice:
1. During our demo ranges, we've occasionally been quizzed on what type/weight of explosive was used both by sound and by resulting crater with regard to the type of soil.
2. An errant blackhawk landing NEAR an unused helipad that resulted in cracks and thumps of stones and pebbles splattering against people (and the food on the grill).
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