This theme plays during intro cutscene. I found it on youtube.

Fallout New Vegas - Intro Music

Taken from https://www.youtube.com/playlist?list=PLU8UCUGzxN9zZYwnWZAlGNMM1AieBJIKq

Helldivers (2015) OST - ILLUMINATE Hazard 9+ Track 1

I post things that are not on this website. 
(Besides reposts of course!)