Firefight tier unlock rate question

Games Halo 5: Guardians
1

So, apologies if this is answered somewhere else, but I did a quick search and couldn’t find anything.

What affects the speed at which new tiers are available during a match? I’ve noticed during a match I’ll have just unlocked tier 2 and another player will go by me in a tank or a banshee . . . how do you speed up the tiers unlocking?

Getting kills and not dying? Is there more too it other than that?

2

A lot of it is getting kills and assists. If you’re playing standard WZ as well, captures add big chunks of progress to your req level

3

Stringing kills together will help too