订阅以下载
Tank Music from Warship Girls R

Replace tank music.

You can listen to it at https://music.163.com/#/song?id=1311680933
It's a Chinese webpage, sorry this is the only source I can find. You only need click on the play button (with a play icon) and it should be able to play.

===== Music Info =====
Title: 活动战役VI (Event Campaign VI)
Author: 月代 彩 (Tsukishiro Hikari)
From: 战舰少女R (Warship Girls R)