Actually, no, Boing Boing, this billboard does not appear to have anything to do with the idea that "Saddam Hussein was the mastermind behind 9/11." It merely illustrates the idea that Iraq is part of the larger war against Islamic terrorists. That the war started with 9/11 and is thus illustrated this way is unfortunate; it should have started much earlier, with the previous attack on the WTC, with the USS Cole, with the Beirut bombing, with the Iranian invasion of the US Embassy in 1979.

Welcoming home a solider from Iraq, and reminding him (and everyone else) that there's a wider battle being fought, is not something that should be exposed to such snide comments from Boing Boing. At least, they should try to avoid being outright misleading.