What is the fastest way to upgrade your REQ level during Warzone? & Do cards last multiple rounds?

[Samurai Raiden]

I'm not talking about earning REQ points, I'm asking: During Warzone, does the entire team's REQ level go up together or do you unlock REQ levels personally? 

Also

 

I've noticed that when I use an XP boost during Warzone, in the loading screen for the next game I play, it still looks like it is active. Do XP boost cards last for multiple games or are they 1 time use?

[Guts]

You do have to earn each REQ level yourself but there's a timer for each level.

 

If you don't reach the next REQ level before that time runs out then your automatically pushed up to it. It only goes to 3 or 4 though.

 

If you activate an XP boost it lasts one game BUT THE GAME AUTOMATICALLY SETS ANOTHER ONE ON. So unless it's deactivated it uses all of your boosts

Edited October 29, 2015 by Kakashi Hecate