Most people over a certain age remember where they were on Sept. 11, 2001, and have a story about that day. Fifteen years later, it's practically a cliche to call Sept. 11 a day when everything changed. But for the thousands of men and women who decided to join the US military after the attack, it really did change everything.
We reached out to our online community of veterans to hear their reflections on 9/11, why they joined up, and what's happened since.
Here's what they had to say. Their responses have been edited for clarity.