Adds the Helicopter battle theme/HECU battle theme from the Half Life games. Also adds Klaxon Beat as the stealth track. https://www.youtube.com/watch?v=GXc-Qk6YlGI&ab_channel=Valve-Topic Requires Custom OST https://modworkshop.net/mod/27359 Install: Drop in Mods folder. (Steam\steamapps\common\PAYDAY 2\mods)
