You're being discharged to accept the appointment as warrant-officer.
5 seconds sound clip from the At War with the Army (1950) movie soundboard.
You can hear this line at 00:29:59 in the DVD version of the movie.
Quote context
[...]
- Go ahead and read it for yourself.
- Sergeant Puccinelli, Nelly will be...
- Oh calm yourself Sergeant. Your application for warrant-officer has come through.
- You're being discharged to accept the appointment as warrant-officer.
- Me an officer? Well, that's worse.
- Will you make out tomorrow's morning report and send it to battalion?
- Yes, from now on, they want it in the night before.
- It's a discharge, so I can become a warrant-officer. Congratulations!
[...]