The Officer Qualification Record (OQR), NAVMC 123a, is one of the best sources of information concerning US Marine officers. It is similar to the enlisted Service Record Book (SRB) with only minor differences. This "record presents a cumulative and concise summary of basic events in the officer's career from the time of acceptance of appointment to separation. The OQR also serves as the basis for reporting information into the Marine Corps Total Force System and provides commanders with background information to assist them in officer personnel planning and assignment."