Sen. McCain was right and the National Review Online is wrong. Politifact, the St. Petersburg Times' truth-testing project (which this week was awarded a Pulitzer Prize), scrutinized Sen. McCain's statement and found it to be true. Here's the money quote from Politifact:

"McCain is referencing the Tokyo Trials, officially known as the International Military Tribunal for the Far East. After World War II, an international coalition convened to prosecute Japanese soldiers charged with torture. At the top of the list of techniques was water-based interrogation, known variously then as 'water cure,' 'water torture' and 'waterboarding,' according to the charging documents. It simulates drowning." Politifact went on to report, "A number of the Japanese soldiers convicted by American judges were hanged, while others received lengthy prison sentences or time in labor camps."