Masks required at Fort Carson regardless of vaccination status KRDO FORT CARSON, Colo. (KRDO) -- Effective July 31, masks will be required while inside all Fort Carson facilities regardless of vaccination status. Fort Carson reinstated the mask wear policy following the Deputy Secretary of Defense's Memorandum, "Updated Mask Guidance for all DoD Installations and Other Facilities," on July 28. 4ID and Fort Carson say this mask mandate is to protect unvaccinated personnel against the Delta variant. Masks are required for: