The White House’s Office of Legal Counsel and others finally decided that the same legal analysis they had applied to al-Qaeda could be applied to the FARC. Killing a FARC leader would not be an assassination because the organization posed an ongoing threat to Colombia. Also, none of the FARC commanders could be expected to surrender.
Bush and Congress' reasoning: They feared Colombia would become a failed state and have an even greater role in sending drugs to the U.S. They wanted to use the military to prevent this.
Here's how it worked:
To hide the use of the PGMs from public discovery, and to ensure maximum damage to a FARC’s leaders’ camp, the air force and U.S. advisers developed new strike tactics. In a typical mission, several A-37 Dragonflys flying at 20,000 feet carried smart bombs. As soon as the planes came within a three-mile “basket” of the target, a bomb’s GPS software would automatically turn on.
The Dragonflys were followed by several A-29 Super Tucanos, flying at a much lower altitude. They would drop a series of dumb bombs in a pattern nearby. Their blast pressure would kill anyone close in and also flatten the dense jungle and obscure the use of the smart bombs.
Then, low-flying, Vietnam-era AC-47 gunships, nicknamed Puff the Magic Dragon, would strafe the area with mounted machine guns, “shooting the wounded trying to go for cover,” according to one of several military officials who described the same scenario.
Shooting the wounded as they tried to take cover? Nice.
As for the CIA and NSA:
The CIA also spent three years training Colombian close air support teams on using lasers to clandestinely guide pilots and laser-guided smart bombs to their targets.
Most every operation relied heavily on NSA signal intercepts, which fed intelligence to troops on the ground or pilots before and during an operation. “Intercepts . . . were a game changer,” said Scoggins, of U.S. Southern Command.
The CIA trained Colombian interrogators and created databases of the debriefings.
The CIA also trained Colombian interrogators to more effectively question thousands of FARC deserters, without the use of the “enhanced interrogation” techniques approved for use on al-Qaeda and later repudiated by Congress as abusive. The agency also created databases to keep track of the debriefings so they could be searched and cross-referenced to build a more complete picture of the organization.
The NSA didn't just collect records. It wiretapped and planted listening bugs.
They [Colombians] helped make sense of the NSA’s voice intercepts, which often used code words. Deserters also sometimes were used to infiltrate FARC camps to plant listening devices or beacons that emitted a GPS coordinate for smart bombs.
The NSA lawyers: It's self-defense:
U.S. national security lawyers viewed the operation as an act of self-defense. In the wake of 9/11, they had come up with a new interpretation of the permissible use of force against non-state actors like al-Qaeda and the FARC. It went like this: If a terrorist group operated from a country that was unable or unwilling to stop it, then the country under attack — in this case, Colombia — had the right to defend itself with force, even if that meant crossing into another sovereign country.
This was the legal justification for CIA drone strikes and other lethal operations in Pakistan, Yemen, Somalia and, much later, for the raid into Pakistan that killed Osama bin Laden.