Rear cover is creased. There are two paperclips marking pages.
Includes a return label (for the STU) and a fold-out quick-reference chart, both bound at the back.
The STU-III was the primary encrypted telephone in used by the US Government from 1987 until it was replaced by the STE (see: L-3 Communications Secure Terminal Equipment (STE - Office)) by 2008. See also: Power supply for Motorola STU-III.