I was talking to my old man the other day. Way back when, he got in some violent traffic dispute and was forced to join the military, and since he had a background in welding, he was put into the Seabees. Stayed there for thirty years. Now, he brought up a drill they were taught called 'mad moment', not 'mad minute', but mad moment. He described it as if their fortification was about to be imminently overrun, they were to receive a command through the radio that would repeat 'mad moment' a couple times and every able man was to start indiscriminately spraying mortars and grenade launchers in at least the vague direction of the enemy in hopes of breaking them. Problem is, I can't find a single mention of this absolutely anywhere online. I very much doubt he's lying or embellishing, so I ask, has anyone else heard of this before? Could anyone point me towards a solid reference?
Anyhow, more particularly on-topic with this thread, how prevalent was the use of heavy artillery in Vietnam? Considering we usually didn't know where the enemy exactly was, and the repeated relevance of airstrike and gunship runs, I can't imagine it was used all too often.