The guns of WWI fell silent 100 years ago. God willing that we never see conflict like that again - there's a reason why secular pacifism came into existence after WWI.
It was a war with horrific military casualties - casualties really only exceeded by WWII - and even more horrific civilian casualties - including no less than three separate genocides committed by the Ottoman Turks.
But in this uncertain world, there is really only one thing that I'm sure of: War will come, and the American Soldier, Sailor, Marine, and Airman. So thank a veteran this armistice day - and remember, even those who just fixed diesel engines or radios faced the possibility of doing that in a war zone.