This soldier training publication (STP) is intended for soldiers holding MOS 27X, Skill Levels 1, 2, 3, and 4, their supervisors, trainers, and commanders. It contains a MOS Training Plan providing information needed to plan, conduct, and evaluate unit training, one of the most important jobs of military leaders. It includes standardized training objectives in the form of task summaries that can be used to train and evaluate soldiers on critical tasks supporting unit missions during wartime. Soldiers holding MOS 27X should have access to this publication. Trainers and first-line supervisors should actively plan for soldiers' access, making it available in work areas, unit learning centers, and unit libraries. However, it is not intended for an individual copy to be provided to each MOS holder. Tasks in this manual apply to both Active and Reserve Component soldiers. The proponent of this publication is HQ TRADOC. This soldier training publication (STP) identifies individual MOS training requirements for soldiers holding MOS 27X. Commanders, trainers, and soldiers should use it to plan, conduct, and evaluate individual training in units. The STP is the primary MOS reference for supporting self-development, evaluating MOS proficiency, and training of 27X soldiers. Commanders employ two primary methods to evaluate soldiers' proficiency: Commander's evaluation. Commander's evaluations are local tests or assessments of soldiers' performance of MOS-specific and common tasks critical to the unit mission. They may be conducted year-round. Common task test (CTT). CTTs are hands-on tests used to evaluate proficiency on common tasks. Alternate written tests are provided if equipment is not available for hands-on testing. This publication is the soldier's primary reference to prepare for a commander's evaluation of MOS-specific tasks. It contains task summaries for all critical tasks specific to the MOS and skill level (SL). Commanders and trainers will use this soldier's manual/trainer's guide (SM/TG) to plan and conduct training and commander's evaluations. Chapter 2, Trainer's Guide, contains information needed to plan training requirements for this MOS. The trainer's guide Identifies subject areas in which soldiers must be trained. Identifies critical tasks for each subject area. Specifies where soldiers are initially trained on each task. Recommends how often each task should be trained to sustain proficiency. Recommends a strategy for cross-training soldiers. Recommends a strategy for training soldiers to perform higher-level tasks. Use this STP along with STP 21-1-SMCT (Soldier's Manual of Common Tasks, Skill Level 1), STP 21-24-SMCT (Soldier's Manual of Common Tasks, Skill Levels 2-4), Army training and evaluation programs (ARTEPs), FM 25-4 (How to Conduct Training Exercises), FM 25-5 (Training for Mobilization and War), FM 25-100 (Training the Force), and FM 25-101 (Battle-Focused Training) to establish effective training plans and programs that integrate soldier, leader, and collective tasks."