That's a really cool one! Looks OBEY-ish...cuz he uses a lot of bombs...well atleast in his more recent work.
You made me think and I looked it up on the internet. It's not OBEY, but a guy called Banksy. A Graffiti artist from the UK. Here you can find more of his work: http://www.banksy.co.uk/outdoors/horizontal_1.htm