US Military Instructors Manual by J. P. Cole and Oliver Schoonmaker, 1917. Covering a number of topics the introduction states that 'It is hoped that this work will serve to recall to many officers, valuable points of military training which would otherwise be lost, to them in the mass of notes never looked at since the day they were made. More than this, every reader will find help in planning his work, saving thereby precious hours already too full of necessary duties, and will find fresh material for progress in the game of war. It is the purpose of this book to help men who are in the service of the United States, and through them to share in bringing victory.'