World War I started. Then it ended on November 11th, 1918, at 11 AM, because the political leaders at that time apparently liked the number 11 a lot. Then the war kept going on for some people, because they didn't get the memo. But anyways.
Woodrow Wilson decided that celebrating this day would be a good idea, and they did so, with much pomp and circumstance.
Then, after World War II, Raymond Weeks said it would be cool to just celebrate all veterans.
And they did so. With much pomp and circumstance.
And that's what today is all about. Not only is it sort of a "free space" on the "thankfulness list", it's a good thing to be thankful for.
Let's not be under any illusions here. Yes, there are some wars where it is questionable as to how necessary they actually were. But really, there are crazy people out there that like to do things like oppress the crap out of people (because even real-world dictators do not read the Evil Overlord List), and some of them just like using their religion as an excuse to blow things up. And sometimes they don't even need that as an excuse. Sometimes they blow things up because reasons.
That's where our soldiers come in. They're actually out there dealing with nigh-cartoonish supervillainy that shouldn't exist in the real world but does, because again, people don't read the Evil Overlord List.
They also deal with less-cartoonish supervillainy, natural disasters, and having a lot of people be angry at them for various things such as "being American" "being a soldier" "some other guy did something bad so I'm going to take it out on you" and, of course, "you won't let me blow up what I want to blow up".
So today let's be thankful for the veterans who are sent away from home for long periods of time under often stressful and horrible conditions to keep us and other people safe.
Thank you, truly.
Now here's the coolest picture I could find to represent this holiday.