This manual is one of a series of Soldier training publications that support individual training. Commanders, trainers, and Soldiers will use this manual and STP 21-1SMCT, Soldier's Manual of Common Tasks, Warrior Skills Level 1, to plan, conduct, sustain, and evaluate individual training of warrior tasks and battle drills in units. This manual contains an Army Warrior Training plan for warrior leader skills level (SL) 2 through SL 4 and task summaries for SL 2 critical common tasks that support unit wartime missions. This manual is the only authorized source for these common tasks. Task summaries in this manual supersede any common tasks appearing in MOS-specific Soldier manuals. Training support information such as reference materials, websites, ammunition requirements, and reproducible evaluation forms are also included. Trainers and first-line supervisors will ensure that SL 2 through SL 4 Soldiers have access to this publication in their work areas, unit learning centers, and unit libraries. This manual applies to the Active Army, the Army National Guard (ARNG)/Army National Guard of the United States (ARNGUS), and the U.S. Army Reserve (USAR).This manual contains the critical common tasks for warrior skills levels 2, 3, and 4. Mastering the performance of these tasks will help the individual Soldier and the Soldiers that he or she supervises fight better and survive on the battlefield, and perform across the full spectrum of operations. Each Soldier must be able to perform all common critical tasks for that skill level and below. The individual Soldier shares responsibility with the trainer to sustain the skills and knowledge required to perform all warrior skills and warrior leader skills. a. Individual Soldiers. To ensure that you can perform each task, have another Soldier or your supervisor periodically evaluate your performance using the task summaries. If you have questions about how to perform a task or which task to perform, ask your first-line supervisor. The first-line supervisor knows how to perform each task and can direct you to the appropriate training materials. You should also check the Reimer Digital Library for new training materials. It is your responsibility to use these materials to maintain your proficiency. b. Trainers. If you are a supervisor and trainer and have Soldiers working for you, you must train them to do the tasks for their skill level and below. Commanders and trainers should use the Soldier's Manual of Common Tasks (SMCT), military occupational specialty (MOS) specific soldier's training publications (STPs), and mission training plans (MTPs) to establish effective training plans and programs which integrate individual and collective tasks.