It is possible to reschedule an interview for "good cause." Members of the military also are able to reschedule interviews, and there are special provisions for service members. USCIS “understands that deployments are a part of military service. If you are submitting an application or petition to USCIS, and are scheduled to deploy in the near future, write in bold letters, ‘I have an upcoming deployment’ on the first page of the application/petition, or on a cover sheet attached to your application. If you have already submitted your application and need to notify us of an upcoming deployment, contact the USCIS Military Help Line at 877-CIS-4MIL (877-247-4645, TTY 800-877-8339) as soon as possible." More information about deployments and moving for members of the military can be found on the USCIS Military Helpline.