While specific facilities security requirements vary depending on your work location, there are always badging and identification standards for access to Marine Corps work areas. At a minimum, you will be expected to carry your
Common Access Card (CAC) at all times.
The CAC, a "smart" card about the size of a credit card, is the standard identification for active-duty military personnel, Selected Reserve, DoD civilian employees, and eligible contractor personnel. It is also the principal card used to enable physical access to buildings and controlled spaces, and it provides access to defense computer networks and systems, as well as the DoD Shuttle system in Washington, DC.
You cannot receive your CAC until your initial personnel action has been processed and an appropriate background check has been conducted. Since this typically is complete 4-7 business days after your arrival on duty, you should work with your new office to ensure that you will have appropriate access to facilities and computer networks during this interval.
For more information about Common Access Cards, including the process involved in obtaining one, please refer to
http://www.cac.mil/.