Editorial note: This August 6, 2018, letter from the Department of Defense appears in Jacket2 as part of “FOIA Request #SC 15–102-S: The Detainee Library,” Jordan Scott and Stephen Voyce’s feature devoted to obtaining a list of contents held at the library at the US Guantánamo Bay detention camp on the coast of Guantánamo Bay in Cuba. The 2018 letter accompanies the two archives that appear in this feature. — Julia Bloch