Mr. Hemrick was apparently referring to Unfit for Command: Swift Boat Veterans Speak Out against John Kerry by John E. O'Neill and Jerome R. Corsi, which comes from the same people who sponsor the web site SwiftVets.com and a TV ad selling the same message.

Refutations may be found at

The Wall Street Journal (often regarded as the flagship of conservative opinion in the US; they were rabidly anti-Clinton)

Disinfopedia

salon.com

eRiposte.com

Urban Legends Reference Pages

FactCheck.org

spinsanity.org

the official Kerry-Edwards website

Most telling of all, the ad was denounced by John McCain, a Vietnam veteran and Senator.