Yes, there is a shadow on the wall behind the men. The shadow is caused a rising sun (could be setting sun - but indulge my fantasy, please). The only shadow I see is of the two Marines. The Marine on the left is one of the finest things I've seen in a long time. I wish the Marine on the right would give me a chance at closer inspection. Should that inspection ever occur you'd have my analysis as soon as I could catch my breath.
That'd be more fun than this photo ... oh yeah, those too!
LOL! There's 3 guys there and a light in the background. There's one in front of the light keeping the light off the one on the right, and making that image on the wall. I'm sure they were ROTFLTAO making that pic and getting it out!