I have a Top Secret security clearance now. If I pass all the testing and assessment stages for the Foreign Service, would I be eligible for a job immediately?

Your entire file will be reviewed to determine your suitability for appointment to the Foreign Service before you are offered a job. Even if your current Top Secret security clearance is valid, updated background investigation may be required to ensure the Suitability Review Panel has current data to make their determination.  These determinations require background investigations that have been completed within the past three years.