Hello, one song is "Guanxia" and the other is "Summer".

In Baidu's mp3, you can play "Soldier Assault Background Music" and you can find a lot of background music. It can also be downloaded.

There is also a military website:

bbs.5281.net

You can find any background music related to the military there. It even includes classic lines from "Soldier Assault". You can listen to it and download it.