SINGAPORE: The Egyptian who guards the elusive Osama Bin Laden has taken over as al-Qaeda's military commander following capture of Khalid Sheikh Mohammed, the mastermind of September 11, a terrorism expert says. Saif al-Adel, who has a $25 million price on his head on the FBI's list of most wanted terrorists. ‘‘They chose him because he is their most competent man and he fits the typical al-Qaeda, Islamic jehad mindset,’’ said Rohan Gunaratna.