Salim Ahmed Salim Hamdan is a Yemeni man, captured during the invasion of Afghanistan, declared by the United States government to be an illegal enemy combatant and held as a detainee at Guantanamo Bay from 2002 to November 2008. He admits to being Osama bin Laden's personal driver and said he needed the money.

An unlawful combatant, illegal combatant or unprivileged combatant/belligerent is a person who directly engages in armed conflict in violation of the laws of war and therefore is claimed not to be protected by the Geneva Conventions. The International Committee of the Red Cross points out that the terms "unlawful combatant", "illegal combatant" or "unprivileged combatant/belligerent" are not defined in any international agreements. While the concept of an unlawful combatant is included in the Third Geneva Convention, the phrase itself does not appear in the document. Article 4 of the Third Geneva Convention does describe categories under which a person may be entitled to prisoner of war status. There are other international treaties that deny lawful combatant status for mercenaries and children.