take rough #s:

US population roughly: 300,000,000
US transportation death per year:４１８００ as above

coalition troop:300,000 invasion
~177,000 current (http://en.wikipedia.org/wiki/Iraqi_War)
US death in less than 5 years: 3922

even count all coalition in US troop, that's 1/1000 of the whole US population, the death in 5 years is less than 1/10 of the death from traffic accidents, translating as less than 1/50 per year of the of traffic accident, which roughly translated as roughly 20, definitely more than 15 times more dangerous.