Final answer:
Unit Training Managers or designated military personnel are responsible for identifying Soldiers for training and making reservations in ATRRS. They manage enrollment and ensure Soldiers receive necessary training for their development.
Step-by-step explanation:
The individuals responsible for identifying Soldiers and making reservations for course attendance in the Army Training Requirements and Resources System (ATRRS) are Unit Training Managers, School/Training Course Managers, or other designated personnel within the military training management structure. Once a Soldier has been identified for a course, these officials will log into ATRRS to reserve a slot and manage the necessary arrangements for the Soldier to attend the training course. This process ensures that soldiers receive the appropriate training aligned with their roles and career progression within the military.