I thought they used the M121 to clear vegetation...
https://en.wikipedia.org/wiki/M-121_(bomb)
A quote from the above article...
"Besides clearing the jungle and preventing the ambush of helicopters that were approaching the landing zone (the M121's blast diameter was 60 meters), the explosion also stunned the NVA or Viet Cong personnel within 500 meters and revealed or destroyed booby traps in the landing area."

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