Final answer:
To be promoted to SSGT, one must obtain the skill level of Journeyman.
Step-by-step explanation:
In order to be promoted to the rank of Staff Sergeant (SSGT), one must obtain the skill level of Journeyman in the business field. The skill levels in the military are denoted by different occupational specialties, and the skill level required for promotion varies depending on the specific career path. The journeyman level signifies that an individual has achieved a higher level of expertise and competence in their field, which makes them eligible for promotion to the rank of SSGT.