The Black Hawk helicopter was ready for take off – its rotor blades slicing through the air in the deadening heat of the Colombian Amazon. We ducked low and crammed in alongside the Jungle Commandos – a police special operations unit armed by the Americans and originally trained by Britain's SAS, when it was founded in 1989. The commandos were heavily armed. The mission was familiar. The weather was clear. But there was tension on board, kicking in with the adrenaline. When you go after any