Foxtrot in Kandahar is an astounding book, in that the author was so close to so many historical events, and somehow manages to draw the tritest and least introspective or insightful conclusions imaginable.
Evans was a CIA officer just off a tour as chief of mission in South America, when 9-11 happened. With a war on, Evans knew he had to get to Afghanistan. Since he had been in the Army a few decades back(officer and Ranger School, before going to the CIA), and spoke Farsi, in the right light he might look like an unconventional warfare expert, ready to parachute into a foreign country and overthrow its government like it's 1955.
Of course, what we really get is bureaucratic SNAFUs. All the mountaineering gear in the DC area has been brought up. The Pakistan CIA station, which has been doing most of the work in Afghanistan, disagrees with the Counter-Terrorism people in Langley. Evans' doesn't have the ability to communicate securely with headquarters, becuase he lacks the right crypto-gear. An Air Force Special Forces team might, but they don't have permission to go into Afghanistan, and et cetera.
This doesn't even get into the actual unconventional warfare part of the American invasion. The initial footprint in Afghanistan was very light, a handful of CIA officers and military Special Forces, with radios that let them call on the USAF. The fighters were almost all Afghani locals, who'd been doing something very much like this since 1979. It was all personal loyalties, local warlords with a few hundred fighters in battered Hiluxes.
Intelligence work is about information above all, and Evans is interested in Afghanistan not for its own sake, but because Al Qaeda may have left clues about its members and plots. And he does discover a plan to attack an American carrier in Singapore, and also blowup his entire team and their Afghani counterparts on Eid. But despite fighting beside these guys for months, Evans has almost no insight into them. They're willing to fight the Taliban and like American airpower, so they must be okay guys, right? I feel like there's something a little deeper there.
As the Afghanistan War turns 18, and the first soldiers born after 9-11 go through bootcamp, there's a time to reflect on this bleeding ulcer of a failed policy. Surely the attempts to go from Taliban control to centralized modern state under Hamid Karzai while also fighting in Iraq were disastrous, but have we learned anything from those disasters? Evans hasn't.