Massive Dirty Bomb Exercise Set For June: “We Are Clearly Seeing An Undeniable Buildup To A So Far Unknown Event” Prison Planet.com Posted on May 31, 2015 Posted in Aggregated No Comments Tagged with Featured Stories, Tile Alex Thomas | A massive simulated dirty bomb attack exercise is set to take place at the end of June in Grand Rapids, Michigan. Share this:Share Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Email a link to a friend (Opens in new window) Email