Students from Osbourn Park High School examine the Gyro-Stabilized Crew-Served Weapons Mount at the 2019 Modern Day Marine Expo on Marine Corps Base Quantico, Va., Sept. 19, 2019. Modern Day Marine is an expo which allows Marines to see the new premier military equipment, systems, services and technology that can be purchased to support the military in the future. - Students from Osbourn Park High School examine the Gyro-Stabilized Crew-Served Weapons Mount at the 2019 Modern Day Marine Expo on Marine Corps Base Quantico, Va., Sept. 19, 2019. Modern Day Marine is an expo which allows Marines to see the new premier military equipment, systems, services and technology that can be purchased to support the military in the future.