I was there pre-Tet Offensive & CRB was about the safest place in VN. There was a large Air Force Base (where I was stationed) as well as a large Army Depot & also, I believe, a Navy facility/port at CRB when I was there - Oct 66 to Oct 67. The various facilities were separate - several mile part. Beginning sometime in 67, CRB Air Base was major port of entry for troops coming in country, (or leaving for the "world") via civilian airlines. I came into Sigon on a USAF C-141 & left from CRB on Braniff Airlines - seems like it was a stretch DC-8.