Thank you to everyone who participated. You can read the published responses here.

Three years ago, British forces left Iraq. Seven months later, the last American forces did the same. Now Sunni militants are taking the very cities allied troops were supposed to set free. The ongoing attacks have raised questions not just about how the world will respond – President Obama said on Friday afternoon that US officials will be "reviewing options in the days ahead" – but about the impact and legacy of a decade-long Iraq war that cost thousands of lives and trillions of dollars. Two veterans of Operation Iraqi Freedom have shared their perspectives on the Guardian, but we know there are many more out there. Did you serve in Iraq? We want to hear from you.

Tell us:

What do you make of the advance of the Islamic State of Iraq and the Levant (Isis)? Did you foresee an unstable future for Iraq during your service? Or were you more hopeful? What should the response be now? Share your reflections with us below, and we'll publish some of your responses on the Guardian.

