Lt. Col. Paul F. Bertholf with Headquarters Marine Corps checks out the latest weapon technology at a display during the Modern Day Marine Military Exposition at Marine Corps Base Quantico, Va., Sept. 29. Although many of the products were not currently in use by the Corps, the exposition gave vendors the opportunity to promote their products to Marines. - Lt. Col. Paul F. Bertholf with Headquarters Marine Corps checks out the latest weapon technology at a display during the Modern Day Marine Military Exposition at Marine Corps Base Quantico, Va., Sept. 29. Although many of the products were not currently in use by the Corps, the exposition gave vendors the opportunity to promote their products to Marines.