Back in 2013, MuckRock user Jasper Craven filed a FOIA request with the State Department for records regarding Dennis Rodman’s 2013 trip to North Korea. After nearly two years of processing, the agency released 18 pages of cables, almost completely redacted under the b(1) national security exemption.

With Sunshine Week just around the corner, we wanted to count down the days to our favorite time of year with a closer look at what’s going on behind the black bars: the nine federal FOIA exemptions. Today, we’re kicking things off with the big one: b(1), the national security exemption.