MCO 1210.9A governs Lateral Move programs for Marine Corps officers and their use to manage officer inventory requirements.
View MCO 1210.9A on armypubs.army.mil
It defines over, short, and balanced PMOSs and establishes voluntary and involuntary lateral move eligibility criteria. It also specifies application routing, qualification determinations, and semiannual MARADMIN announcements.
Over Military Occupational Specialty (MOS) - A PMOS with an onboard inventory greater than 105% of total manpower requirement or requirement in grade. (paragraph 1)
Short Military Occupational Specialty (MOS) - A PMOS with an onboard inventory less than 85% of the total manpower requirement or requirement in grade. (paragraph 1)
Any unrestricted officer in the grade of lieutenant colonel or below who desires to move from an over PMOS to a short PMOS and is deemed qualified, may apply for the VLM Program. (paragraph 4)
Officers may not apply for LM into primary MOSs 4402 or 75XX under this Order. (paragraph 4)
Officers must possess a regular commission and be willing to accept an Extended Active Duty (EAD) to ensure a minimum of three years of service obligation following the completion of the new PMOS school. (paragraph 4)