Given they have a field named "Country", they can't expect that everyone will have a US document. In this case, I would simply supply an ID number/type of a Dubai document. Also, check the lists on the links mentioned in the letter and answer accordingly.
Similar for the other questions: if military or civilian use, if the components will be re-exported, etc.
Just answer truthfully. It will go long way in getting their approval.
Just a disclaimer: I am not a lawyer or an expert in foreign commerce. I am a foreign national in US and had to fill zillions of these types documents throughout the years for various reasons.