retired colonel tim garrity commanded the peacekeeping mission in lebanon. >> the past three iranian ministers of defense, including the current one, selected a few months ago, all have peacekeepers' blood on their hands and are leading the iranian lockstep march for the acquisition of nuclear weapons. >> reporter: at camp lejeune today, marines marked the 30th anniversary, the deadliest single day for u.s. marines since iwo jima. donald was outside the barracks. his brother was killed instantly. >> i live with survivor's guilt. we were the beginning of the new war. we were its first casualties. but we survived and we lived. and we're here. >> the attacks on the marine barracks in beirut really define the beginning of what became known today as the war on terror. >> reporter: radical islamists realize the power of the suicide truck bomber for the first time. osama bin laden referred to it as a model for future attacks. >> the united states, the italians, the french, the brits, everybody pulled out and that was the lesson that was learned by radical islamic terrorists. >> reporter: it