MANPOWER MANAGEMENT EVALUATION REVIEW (MMER) BRANCH . . AGENGA. Mission of MMERMMER Functional Areas RE-Codes/BCNR AdminPERBPOC\'sQuestions and Answers Review of inappropriate comments. MMER\'s Mission . To serve as the Marine Corps\' initial action agency for fitness report appeals, which are submitted to the Board for Correction of Naval Records (BCNR) and make determinations on requests from former Marines to change/upgrade their Re-enlistment Codes (RE-Codes). .