acm software package provides Multi-player classic aerial combat simulation, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install acm
acm is installed in your system.
Make ensure the acm package were installed using the commands given below,
$ sudo dpkg-query -l | grep acm *
You will get with acm package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Games |
| Package | acm |
| Version | 5.0-29.1 |
| Description | Multi-player classic aerial combat simulation |
| Sub Section | Games |