You can use assets from Valve games, we have a license for their assets and they can be used in maps that are created for Day of Infamy.
We're not using any soundscapes from CSGO and DOD, they're not included in DOI.
However, if you want to use them. You have to extract the files yourself from CSGO and DOD and pack them in your BSP.
@Bastion That's some true dedication man. I hope you can find a better monitor