An Israeli soldier stands next to Merkava Mark IV tanks in a deployment area near the Syrian border in the Israel-annexed Golan Heights on May 10, 2018. (Photo: Menahem Kahana / AFP / Getty Images)

With Donald Trump’s decision to shred the Iran nuclear agreement, announced last Tuesday, it’s time for the rest of us to start thinking about what a Third Gulf War would mean. The answer, based on the last 16 years of American experience in the Greater Middle East, is that it won’t be pretty.

The New York Times recently reported that US Army Special Forces were secretly aiding the Saudi Arabian military against Iranian-backed Houthi rebels in Yemen. It was only the latest sign preceding President Trump’s Iran announcement…