Col. Joseph Murray, commander of Marine Corps Installations National Capital Region-Marine Corps Base Quantico, and Aeris Taylor, the high school senior who oversaw the trail construction for an Eagle Scout project, unveil a sign marking the new Semper Progrendi Trail at a ceremony Sept. 14. - Col. Joseph Murray, commander of Marine Corps Installations National Capital Region-Marine Corps Base Quantico, and Aeris Taylor, the high school senior who oversaw the trail construction for an Eagle Scout project, unveil a sign marking the new Semper Progrendi Trail at a ceremony Sept. 14.