Incredible images from the longest war in American history that started 14 years ago today

Operation Enduring Freedom had the dual objective of hitting back at al Qaeda and their Taliban hosts after the 9/11 attacks and rebuilding Afghanistan into a functioning state.

The Taliban is in the middle of a resurgence with the Afghan military taking unsustainable losses as they assume more of the country's security burden.

It was against this backdrop that photographer Robert L. Cunningham returned to Afghanistan in order to capture the end of combat and the sense of the unknown that is now permeating both the Afghan and US military about what happens next.

Cunningham is one of a handful of people who have ever taken a Leica Monochrom, a black-and-white only digital camera, into a war zone. The majority of the following images are taken with the Monochrom, although not all of them.

Here are 22 stunning images from the end of the US-led war in Afghanistan.