The only difference is if the cause and the means used are just.
Really?
Suicide bombers- Cowards that don't announce their presence and kill innocent men and woman indiscriminately apart from any national identity or national referendum endorsing these acts.
American military- Authorized representatives of the U.S.A. that announce their presence, seek to miminize ACCIDENTAL civilian deaths, and target ONLY the enemy by order of the elected President and funded by elected representatives of a free people in coordination with another duly free government (Iraq).
Quite a few differences besides merely means and the causes representated. Do not peddle that nonsense to me.