The U.S. Marine Guidebook, often referred to as the "Guidebook for Marines," is a comprehensive manual that provides a wealth of information and guidelines essential for Marines. It serves as an essential resource for both new recruits and seasoned Marines, covering a wide range of topics relevant to Marine Corps life, operations, and philosophy. Here are some key areas typically covered in the guidebook:
 
History and Traditions: It includes the history of the Marine Corps, its traditions, and its role in American military history. This section is crucial for instilling a sense of pride and belonging among Marines.
Leadership Principles and Values: The guidebook outlines the core values and leadership principles of the Marine Corps, such as honor, courage, and commitment, which are foundational to the character of every Marine.
General Orders: It covers the eleven general orders that every Marine must know and follow, which outline the duties of a Marine on guard or sentry duty.
Weapons Handling and Marksmanship: Detailed information on various weapons systems used by the Marine Corps, as well as principles of marksmanship, is provided to ensure proficiency in handling and operating weapons.
Physical Fitness: The guidebook includes standards and guidelines for physical fitness, which is a critical aspect of a Marine's life, including physical training routines and requirements for physical fitness tests.
Uniforms and Inspections: Detailed descriptions of Marine Corps uniforms, grooming standards, and guidelines for conducting and participating in inspections ensure that Marines maintain a professional appearance.
First Aid and Field Sanitation: Basic first aid, life-saving techniques, and field sanitation practices are covered to ensure Marines can provide aid and maintain health and hygiene in various environments.
Tactics and Operations: An overview of basic tactics, maneuver principles, and operational concepts used by the Marine Corps in combat and other missions.
Navigation and Survival: Skills and knowledge related to land navigation, map reading, and survival techniques in different environments are included to prepare Marines for a wide range of operational scenarios.
Marine Corps Organization: Information on the structure and organization of the Marine Corps, including the roles and responsibilities of different units and the rank structure.