The term enemy combatant has historically referred to members of the armed forces of the state with which another state is at war.[1][2] Prior to 2008, the definition was: "Any person in an armed conflict who could be properly detained under the laws and customs of war." In the case of a civil war or an insurrection the term "enemy state" may be replaced by the more general term "Party to the conflict" (as described in the 1949 Geneva ConventionsArticle 3).[3]
In the United States the use of the phrase "enemy combatant" may also mean an alleged member of al Qaeda or the Taliban being held in detention by the U.S. government as part of the war on terror. In this sense, "enemy combatant" actually refers to persons the United States regards as unlawful combatants, a category of persons who do not qualify for prisoner-of-war status under the Geneva Conventions. Thus, the term "enemy combatant" has to be read in context to determine whether it means any combatant belonging to an enemy state, whether lawful or unlawful, or if it means an alleged member of al Qaeda or of the Taliban being detained as an unlawful combatant by the United States.
Unlawful combatants are likewise subject to capture and detention, but in addition they are subject to trial and punishment by military tribunals for acts which render their belligerency unlawful. The spy who secretly and without uniform passes the military lines of a belligerent in time of war, seeking to gather military information and communicate it to the enemy, or an enemy combatant who without uniform comes secretly through the lines for the purpose of waging war by destruction of life or property, are familiar examples of belligerents who are generally deemed not to be entitled to the status of prisoners of war, but to be offenders against the law of war subject to trial and punishment by military tribunals.(Emphasis added)
Under the provisions of the Secretary of the Navy Memorandum Implementation of Combatant Status Review Tribunal Procedures for Enemy Combatant Detained at Guantanamo Bay Naval Base Cuba ... An enemy combatant has been defined as "an individual who was part of or supporting the Taliban or al Qaida forces, or associated forces that are engaged in hostilities against the United States or its coalition partners. This includes any person who committed a belligerent act or has directly supported hostilities in aid of enemy armed forces." [6]
This lead has been followed by other parts of the Government and some section of the American news media. The result of this new usage means that the term "enemy combatant" has to be read in the context of the article in which it appears as to whether it means a member of the armed forces of an enemy state, or if it means an alleged member of al Qaida held prisoner by the United States.
(8) The term 'enemy combatant' has historically referred to all of the citizens of a state with which the Nation is at war, and who are members of the armed force of that enemy state. Enemy combatants in the present conflict, however, come from many nations, wear no uniforms, and use unconventional weapons. Enemy combatants in the war on terrorism are not defined by simple, readily apparent criteria, such as citizenship or military uniform. And the power to name a citizen as an 'enemy combatant' is therefore extraordinarily broad. (Emphasis added)
^ The current United States Department of Defense definition is: "In general, a person engaged in hostilities against the United States or its coalition partners during an armed conflict."(source DOD dictionary enemy combatant)