This is usually what is going on...but I don't think this is what is happening here exactly.
The man sitting in the chair is BG Brad Webb. He is the Assistant Commanding General, Joint Special Operations Command. So...it makes sense that he is sitting there. It is obviously OK for him to be sitting there in Adm Mullen is standing (Chairman, JCS).
If anything...it looks to me like BHO has been photoshopped in (tin foil hat time I know). Makes me wonder if he got off the golf course in time.
The lighting angle on him looks ‘off’.