Which of the following is a condition that must be met for promotion to SPC?

The requirement for promotion to Specialist (SPC) includes a specific condition related to time in service. To achieve the rank of SPC, a Soldier typically needs to have served a minimum of 24 months in the military, which reflects both experience and commitment to the Army. This period allows for the development of skills and competencies necessary for the responsibilities expected of a Soldier at the SPC level.

While completing Advanced Individual Training (AIT) is important for a Soldier's development and readiness, it does not specifically satisfy the time-in-service requirement for promotion to SPC. Similarly, while the completion of the Reserve Support Program (RSP) is a beneficial aspect of training for certain personnel, it does not directly influence the promotion criteria for SPC. Lastly, having one year as a Private First Class (PFC) contributes to a soldier's professional development and experience, but it is the cumulative 24 months of service that is essential for the promotion to Specialist. Therefore, the time in service requirement is the key factor that dictates eligibility for promotion to this rank.