Sentence:  When I was serving on a <WSD>swiftboat</WSD> in Vietnam, my crewmates and I had a dog we called VC. We all took care of him, and he stayed with us and loved riding on the <WSD>swiftboat</WSD> deck. 
Meaning of the word marked with <WSD> tags:  A type of gunboat used by the United States military on inland waterways.