UH?
OK, I'm former Navy and have filled out many leave chits in my day. Most are electronic now. You should have one with in your command intra-net or on a shared drive.
The only major instruction I could find for you is a DoD instruction. I put a link. Most of the other instructions and guidance are local policy. Your major commands will set specifics.
Somehow I get the feeling you made a mistake on not doing your leave right and are given an assignment. Good luck. Look for local instructions.