Submit the below example to your detailer:
DD Mmm YY
From: ENS Write A. Name, USN, 1120
To: Commander, Navy Personnel Command (PERS-42)
Via: Commanding Officer, USS MY SHIP (SSN XX)
SUBJ: REQUEST FOR PROJECTED ROTATION DATE ADJUSTMENT
Ref: (a) MILPERSMAN 1301-104
1. I hereby submit my request for an adjustment of my Projected Rotation Date (PRD) from MONTH YEAR to MONTH YEAR.
2. The reason for this request is to (WHY DO YOU WANT TO CHANGE YOUR PRD?).
W. A. NAME