Soldier Training Publication STP 12-42A12-SM Soldier's Manual and Trainer's Guide for MOS 42A Skill Levels 1 and 2, Human Resource Specialist includes tasks for ASI Additional Skill Identifier F5, Postal Operations) June 2011 US Army. This publication is for skill level (SL) 1 and 2 Soldiers holding Military Occupational Specialty (MOS) 42A and their trainers/first-line supervisors. It contains standardized training objectives in the form of task summaries, which can be used to train and evaluate Soldiers on critical tasks that support unit missions during wartime. Soldiers holding the MOS/SL/ASI 42A1/2 and F5 should have access to this publication.