Let me say this about that.
At Khe Sahn the 122s were the little ones. We were shelled continuously by 152s. The rocket is an area wea[pm rather than pinpoint. When the area is the size of KSCB they rarely missed.
A few memories.
Since you can hear them from ignition to impact they scare the shit out of you.
We had a shower stall made of corrugated tin. It looked like a collander. You needed a buddy outside listening for incoming. Ears became very well tuned and you could hear the rockets and guns from their positions in Laos.
I believe their FO hated me. It seems they would wait until I was "comfortably" seated on the shitter, and then fire one off. He then no doubt laughed his butt off as I came running out of the latrine trying to pull my pants up and hit a trench. The funny part was that the latrine was in a fairly well protected bunker.
99% of all wounds at Khe Sahn were head wounds. Curiosity didn' pay.