Military Careers, commissioning programs - Marine Corps Times

Re-employment

Whether you volunteer for or are ordered to active duty, you are protected from losing your civilian employment. Depending on the type and length of your deployment, you have different amounts of time before you must report back to your civilian job.

Generally, this is within 31 days of your release from active duty for a presidential call-up.

In some cases, that period is extended to 60 and even 90 days.