The Army National Guard while in the service of the United States is a component of the Army.
Structure US Code
Subtitle E— Reserve Components
PART I— ORGANIZATION AND ADMINISTRATION
CHAPTER 1003— RESERVE COMPONENTS GENERALLY
§ 10101. Reserve components named
§ 10102. Purpose of reserve components
§ 10102a. Deployment prioritization and readiness of Army components
§ 10103. Basic policy for order into Federal service
§ 10104. Army Reserve: composition
§ 10105. Army National Guard of the United States: composition
§ 10106. Army National Guard: when a component of the Army
§ 10107. Army National Guard of the United States: status when not in Federal service
§ 10108. Navy Reserve: administration
§ 10109. Marine Corps Reserve: administration
§ 10110. Air Force Reserve: composition
§ 10111. Air National Guard of the United States: composition
§ 10112. Air National Guard: when a component of the Air Force
§ 10113. Air National Guard of the United States: status when not in Federal service