Winston Groom said this quote

It commenced raining one day and did not stop for two months. We went through ever different kind of rain they is, cep'n maybe sleet or hail. It was little tiny stinging rain sometimes, an big ole fat rain at others. It came sidewise an straight down an sometimes even seem to stand up from the ground. Nevertheless, we was expected to do our shit, which was mainly walking upland down the hills an stuff looking for gooks.