The NAVMC 3500.123 Counter-Improvised Explosive Device (C-IED) Training and Readiness Manual, published on May 9, 2019, by the United States Marine Corps, is a detailed guide focusing on training Marines in counter-IED operations. The manual is essential for planning, conducting, and evaluating training within a C-IED threat environment. This summary covers the first 29 pages of the 66-page document. Key highlights include: Introduction: The manual serves as a crucial tool for training Marines to operate effectively in environments with IED threats, emphasizing the importance of standardized training to achieve combat readiness. Training and Readiness Program: It outlines how the T&R program is the primary tool for training management, focusing on mission essential task lists (METL) and Marine Corps tasks (MCT). Unit Training Management: Details the methods for developing training plans based on unit METL and standards-based community T&R events, emphasizing the importance of effective training management. Sustainment and Evaluation of Training: Discusses the importance of maintaining proficiency in training events and the necessity of periodic evaluations to ensure readiness and effectiveness. Combat Readiness Percentage (CRP): Explains the calculation and significance of CRP in assessing the readiness of units and Marines. Risk Management (RM): Highlights the integration of RM in training planning to minimize risks while ensuring mission accomplishment. C-IED Training: Stresses the critical need for C-IED training to operate and survive in environments with an IED threat, integrating C-IED tactics, techniques, and procedures into the training plan. Chapters Overview: The manual contains chapters on collective events, individual events, and appendices with acronyms and definitions. Event Coding and Composition: Provides guidelines on coding training events, categorizing various skills and capabilities, and detailing components such as event conditions, standards, and performance steps. Simulation and Support Requirements: Discusses the use of simulations and the necessary support requirements to accomplish training events, including equipment, ranges, and training areas. This partial summary provides an overview of the initial sections of the manual, underscoring its comprehensive nature in guiding Marines through the complexities of counter-IED operations training.