Who/what is NOT pictured?
Who usually accompanies US politicians to war-torn areas?
US military or some sort of congressional security?
As for the symbol(s)
No particular knowledge of geometric shapes on the ground, is anything notable about spirals in other cultures?
It doesn't seem to be particularly neat. There are many ways to make one near perfect (imagine winding a string around a post as you go: the radius would decrease until it's zero, presto! A spiral!