Final answer:
In the U.S. Army, mandatory training is documented through official Army records, training aids and materials, and historical records maintained by the Center of Military History.
Step-by-step explanation:
In the U.S. Army, all mandatory training is documented in various ways. One of the main ways is through official Army records and studies. These records contain information about the training received by soldiers and are used for tracking and evaluation purposes.
Another way the Army documents mandatory training is through training aids and materials, which provide guidance and information to soldiers on various topics. These materials can include manuals, videos, and online resources.
Additionally, the Army also maintains historical records through its Center of Military History. These records document the history of the Army, including past training practices and policies.