Secret Folder A “secret” cover sheet typically designates a folder that contains classified material that can be viewed only by those with proper clearance. This folder contains no classified material, however, and the cover sheet itself is unclassified. SHARE IMAGE: Download Image: Full Size (1.32 MB) Tags: DOD Photo By: C. Todd Lopez, DOD VIRIN: 190624-D-NU123-001C.JPG Photo Gallery