Final answer:
The basic manual for Army Leadership in the U.S. Army is FM 6-22, which guides leaders in principles and conduct for leading troops.
Step-by-step explanation:
The Field Manual (FM) that is considered the basic manual for Army Leadership within the U.S. Army is FM 6-22, also known as Army Leadership. This manual outlines the essential principles of leadership and how officers, non-commissioned officers, and enlisted soldiers should conduct themselves and lead others in various situations. Leadership is an essential part of military training and operations, and as armies have grown in size, the coordination and leadership of troops have become increasingly complex, necessitating detailed advanced planning and set war plans and tactics to be handled by the general staff. As such, modern leadership has become more professionalized, and the U.S. Army's FM 6-22 provides the guidance and framework needed for current and future leaders in the Army.