Summary: Today is the 16th anniversary of the Oklahoma City bombing and the 18th anniversary Branch Davidian assault in Waco, Texas. Army veteran Timothy McVeigh planned the OKC bombing as revenge for the deadly standoff between the FBI and Branch Davidians in Waco, Texas, that killed more than 70 people on April 19, 1993. … One-year retrospective: One year ago today, on April 19, 2010, Aubrey Immelman reported that U.S. Homeland Security Secretary Janet Napolitano, at a somber ceremony marking the 15th anniversary of the Oklahoma City bombing, warned of the need for continued vigilance against terrorists.