In 2000 the CIA and USAF jointly ran a series of flights over Afghanistan with a small remote-controlled reconnaissance drone, the Predator; they obtained probable photos of Bin Laden. Cofer Black and others became advocates of arming the Predator with missiles to try to assassinate Bin Laden and other al-Qaeda leaders. In the spring of 2001, CIA officers evaluated the forces of Ahmed Shah Massoud, and found his strength less than the previous fall. While the officers gave him cash and supplies, and received intelligence on the Taliban, they did not have the authority to build back his fighting strength against the Taliban. While the American President has issued Executive Orders banning assassinations, none of those actually defined assassination. Using dictionary rather than statutory definition, a common definition is "murder by surprise for political purposes". Jeffrey Addicott argues that if murder is generally accepted as an illegal act in US and international law, so if assassination is a form of murder, the Orders cannot be making legal something that is already illegal. The Hague and Geneva Conventions did not consider non-national actors as belligerents in general war. The Conventions do consider spontaneous rising against invasion and civil war as having lawful combatants, but there are many more restrictions of the status, as legal combatants of fighters who came to a war from an external country. This discussion will not address the controversial issue of illegal combatants, but, following Addicott's reasoning, assumes that violence, in defense to an attack, is legal under Article 51 of the UN Charter. Note that before the attackers in the September 11, 2001 attacks were identified, the US invoked the NATO treaty, without objection, as a member state that had been attacked. "In the War on Terror, it is beyond legal dispute that the virtual-State al-Qa'eda terrorists are aggressors and that the United States is engaging in self-defense when using violence against them." Black and others became advocates of arming the Predator with AGM-114 Hellfire missiles to try to kill Bin Laden and other al-Qaeda leaders, but there were both legal and technical issues. Tenet in particular was concerned about the CIA moving back into the business of targeted killing. Also, a series of live-fire tests in the Nevada Desert in summer 2001 produced mixed results. In June 2001, at a test site in Nevada in the US, CIA and Air Force personnel built a replica of Bin Laden's villa in Kandahar, Afghanistan. The Predator controllers tested aiming and firing a Predator missile at the house, and post-strike analysis showed it would have killed anyone in the targeted room.