The name and insignia indicate it is related to the Persian Gulf Command which was active in the 1940s and served to facilitate the supply of US-made weapons and supplies to the Soviet Union who along with the British were guarding Iran's oil fields as protection from Hitler. That should be enough to get you researching in the right direction.

that looks like a poster from the Gulf War. I've never seen anything like it. Go on ebay and do a search to see if you can find anything like it. It might be worth something.