Maj. Calleen Kinney provides her assessment of the Marine Corps’ modified maternity uniform items aboard Marine Corps Base Quantico, Va, March 4, 2021. In April 2021, MCSC will begin gradually releasing a series of updated maternity items in response to concerns about fit, comfort and appearance. - Maj. Calleen Kinney provides her assessment of the Marine Corps’ modified maternity uniform items aboard Marine Corps Base Quantico, Va, March 4, 2021. In April 2021, MCSC will begin gradually releasing a series of updated maternity items in response to concerns about fit, comfort and appearance.