US contractor employees working in Afghanistan will be required for the first time to obtain visas to enter and exit Afghanistan, under the terms of an agreement that became effective January 1, 2015.
The requirement is included in the Bilateral Security Agreement (BSA) between the US and Afghanistan, signed by Afghan President Ashraf Ghani shortly after his inauguration a few months ago. Details of the visa requirement are being worked out now and will be publicized when a separate document is signed by President Ghani.
US Government contractors are also required under the bilateral agreement to register to do business in Afghanistan with the Afghan government. Details on the new registration process are described in this publication.