The Army Knowledge Online (AKO) Login Portal is located at https://www.us.army.mil and provides access to the AKO Webmail user’s army.mil email as well as a number of other U.S. Army systems and resources. If you’re not registered with an AKO login, then check-out the AKO Account Registration page on how to obtain a login account. You may need a CAC card and a CAC card reader to access some areas of the Army Knowledge Online Website. See the How to register a new CAC page if this is necessary. You can also view and purchase CAC card readers using the smart card readers link.