This U.S. Army manual, Training Circular TC 3-22.19 Grenade Machine Gun MK 19 MOD 3 Change 1 January 2020, is comprised of nine chapters and five appendices, and is specifically tailored to the individual Soldier's use of the MK 19 grenade machine gun. This TC is divided into two major parts to provide specific information about the weapon, aiming devices, attachments, followed by sequential chapters on the tactical employment of the weapon system. TC 3-22.19 is purposely organized in a progressive manner, each chapter or appendix building on the information from the previous section. This organization provides a logical sequence of information which directly supports the Army's training strategy for the weapon at the individual level. Chapters 1 through 4 of this TC describe the weapon, aiming devices, weapon mounts, and accessories associated with the weapon. General information is provided in the chapters of the manual, with more advanced information placed in appendix A, Ammunition, and appendix B, Machine Gun Theory. Chapters 5 through 9 provide the employment, stability, aiming, control and movement information. This portion focuses on the Solder skills needed to produce a well-aimed burst. Appendix C of this publication provides common tactical drills that are used in training and combat that directly support tactical engagements. Appendix D provides zeroing information on this weapon. Finally, appendix E of this publication, is provided at a common location in this and future weapons publications to provide a common location for reference for qualification. TC 3-22.19 applies to all Soldiers, regardless of experience or position. This publication is designed specifically for the Soldier's use on the range during training, and as a reference while deployed. This publication applies to the active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the United States Army Reserve (USAR).