It seems like Warzone Firefight fits the REQ system better than regular warzone. In a regular match of warzone I use my preferred loudout (BR and SMG) in all situations and only call in stuff if we need that extra little push (mostly ghosts and wraiths). However, in firefight I have to think about what I use; kinetic bolts when vehicle bosses show up, grab ghosts during covenant rounds and splatter those fools, tanks to clear the walk-up to final bosses, etc. Firefight is totally unreasonable, with more than a few matches ending in a pair of Wardens being protected by a horde of knights, but it makes that tri-shot rocket a must and I've never felt more satisfied then when I REQ spawned a fuel rod and killed the final hunter boss in the last second. Firefight has saved Halo 5 for me and well most definitely provide me with those endless hours of fun I've been trying to get out of this game.