This U.S. Army manual, Training Circular TC 3-22.6 Guard Duty Change 1 December 2019, provides all Soldiers the doctrinal basis for the detailing, and performance of guard duty. For the purpose of this TC, the term guardhouse refers to any building or area in which the guard will be housed when not physically at a guard post.For ease in distinguishing a preparatory command from a command of execution, the commands of execution appear in BOLD CAP letters and preparatory commands appear in italic letters. The principal audience for this publication includes individual Soldiers and leaders throughout the Army.TC 3-22.6 implements DA Form 1594 (Daily Staff Journal or Duty Officer's Log).This manual applies to the Regular Army, the Army National Guard (ARNG)/National Guard of the United States (ARNGUS), and the U.S. Army Reserve (USAR) unless otherwise stated.