You can view the MCM at mcm.mil. You can get more information about the MCM at http://jsc.defense.gov/Military-Law/Current-Publications-and-Updates.
Run the viewer by serving the contents of the root directory using any webserver and opening index.html. The editor allows a GitHub user with the approriate permissions to push changes to the raw MCM.
The content of the mcm is located in toc.[hash].json and is used to build a search index and the DOM.
TODO: toc.[hash].json build instructions