Chopper Commando v2.57 was updated by Harvey Patterson and released with permission from Mark Currie.

v2.57 (2014-07-04)

- Made the sky blue during day missions
- Fixed a bug that could cause the speaker to be stuck playing a noise if you quit the game during gameplay, and left the video card in the wrong mode if you quit anywhere other than the title screen
- Fixed bugs in the debriefing notes for Missions 8 and 15 that prevented the "This could mean a promotion." message from appearing if rank was 2nd Liut. or 1st Liut.
- Changed the behavior of one of the secret areas
- Corrected a bunch of typos in the game text
- Made minor optimizations to the source code, cleaned up some code formatting and corrected some typos in the comments