Playing with friends is made infinitely harder due to the fact that you cannot tell who is who through walls because names don't appear until you have line of sight AND you are aiming at them.

It would be preferable if party members had different diamond colors (maybe green instead of blue for Security and Yellow instead of red for insurgents). That way we could see them through walls and it would make regrouping with them after dying much easier.

Seconding this feature (for about the 5th time).
If you want to promote teamplay and coordination then being able to locate your teammates is first and formost.

Something like:

party member

• green

steam friends

• blue

normal teammates

• white