--Gary Tuchman, CNN CorrespondentU.S. troops just spent their fifth Christmas in Iraq since the war began in 2003. .
But it's easy to forget the troops have actually now been there for 18 consecutive Christmases.
The Iraqi invasion of Kuwait, the event that kicked off two wars and the no fly zones, occurred in August 1990. It has been so long since American troops have been in the Persian Gulf region in large numbers, that today's 18 year old American GI would have been an infant when this all began.
A gallon of gas averaged $1.16 in 1990; the population of the United States was 20 percent less than today; the Berlin Wall had just come down a few months before. For the United States, what's going on in Iraq is not just a war. It has become an era.