The only thing I ever saw more secure than a SCIF in theater is an LCC at Malstrom AFB, a WSAs at Kings Bay, Barksdale, and Whiteman, and the Pantex plant areas. Saw an E-6 grabbed by the scruff of his neck and thrown out of the SCIF when his cell phone rang (can’t bring them in)
That must have been what I went in back in highschool. Had to sign in, verify all recording devices removed and then was led through an area where all monitors were shut off and blue lights were lit notifying the crew that no sensitive info could be displayed.