Final answer:
Fitness Reports (FITREPs) or Evaluation Reports provide a supplemental record of performance for active duty commanding officers as observed by operational commanders, essential for career development actions like promotions and transfers.
Step-by-step explanation:
The type of reports that provide a supplemental record of performance for active duty Commanding Officers (COs) or Officers in Charge (OICs) as observed by their operational commanders are Fitness Reports (FITREPs) or Evaluation Reports. These reports play a critical role in the career development of military personnel, including promotions, reductions, transfers, and recording casualties. Each entry in these reports must cite the appropriate authority, such as directives, orders, or instructions that justify the action or observation recorded.