Door Gunner

What's that shoulder patch above US flag?

not sure mate, ill look into that?

I'll try too, but I have never seen that one.

42nd Infantry Division

The 42d Infantry Division was a unit of the United States Army in World War I and World War II, and is the division of the New York National Guard.

(normal colours)

Post War and War in Iraq

The Division absorbed the units of the 26th Infantry Division and the 50th Armored Division in post Cold War restructuring. The New Jersey brigade that transferred from the disbanding 50th Division in 1988-9 was initially an armored brigade, but transitioned to an infantry brigade in the very first years of the 21st Century
The division has been the first National Guard division to be sent to the frontline under its own command since the Korean War. Serving as the headquarters of Task Force Liberty and responsible for security operations in four provinces of north central Iraq (Diyala, Salah ad Din, Kirkuk, As Sulaymaniyah), the 42nd Infantry Division directed the operations of 1st Brigade,US 3rd Infantry Division, 3rd Brigade,US 3rd Infantry Division, the 278th Regimental Combat Team, and the 116th Brigade Combat Team.

And with the aid of google

Origin of the Rainbow Patch

Thanks for the info Matzos and Droney!