"A booklet for those who've just entered the Army. Entry paperwork is attached. I don't need this.
The Army Guide, known as the Enlistment Guide (入隊案内書 Nyūtai an'nai-sho ) in the Japanese version, is a special item that can be found in the "end of the road" scenario.
The item can be found in the lower levels of the north waterworks. It is character-specific, however, and Mark Wilkins can only recover it in EASY and VERY HARD modes.