Information the Cutter Cambell's 1967-1968 deployment to Vietnam can be found here:
http://www.uscg.mil/hq/g-cp/history/WEBCUTTERS/Campbell_WPG_32.html
Information on PCF-19 can be found here:
http://www.swiftboats.net/index.htm#pcf10
The Campbell did more than service PCF 19, the crews were based on the Campbell (two crews, one boat). There is some question about the true fate of that boat, the Navy declared it friendly fire, but another swift boater who was on a nearby boat swears that they came under fire from North Vietnamese helos. The Navy says that the N. Vietnamese didn't have any helos. The whole thing was kept pretty quiet.