killer cuts off the head of a corpse: to hide their identity
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Or the person taking the picture sucked and mainly wanted to get zer0 and since he was sitting down, cut off the heads? The one in flip flops is Reggie Love. He wore them a lot during the trip and had the same ones on when he arrived back at the WH with BO and departed Marine1. He also had them on in Paris at the Eiffel tower. Who the other 2 are, I don’t know.
He/She probably thought he looked cool stretched back like that like when we take pictures of family and friends doing silly or unusual things.