The rank of a military psychologist can vary depending on their experience and commissioning status. Typically, newly commissioned military psychologists begin their service at the rank of O-1, which is a Second Lieutenant in the Army, Air Force, and Marine Corps, or Ensign in the Navy. However, many military psychologists enter the service at a higher rank, such as O-3 (Captain in the Army, Air Force, and Marine Corps, or Lieutenant Junior Grade in the Navy), especially if they have prior relevant experience or advanced degrees. The pay scale for officers is determined by their rank and years of service, with the 2024 active duty pay scale indicating that an O-1 with less than two years of service earns approximately $3,826.20 per month. Overall, the specific rank of a military psychologist depends on their commissioning pathway, experience, and the branch of service, but they generally hold officer ranks starting from O-1 or O-3.