Final answer:
The report type used for officers with ranks W-2 to O-6 under the Navy's evaluation system is the 'Fitness Report' (FITREP), crucial for career development.
Step-by-step explanation:
The type of report used for officers at the rank of W-2 to O-6 under the Navy Performance Evaluation System is called a 'Fitness Report' (FITREP). This evaluation tool is designed specifically for tracking the performance, management abilities, leadership qualities, and professional development of officers within the Navy. FITREPs are critical components of an officer's military record and are used in the consideration for promotions, assignments, and other career development opportunities.