Choose next class
There's nothing worse than constantly getting sniped and not having a long-range rifle with which to return the favor, or getting shit on by an enemy drone without the right weapon to take it down with. Thankfully, CoD games let you switch classes mid-game. Just select a different loadout and the next time you respawn, you'll have what you need.
Now, instead of pausing the game and navigating through the menus, you can choose a new class right from the touch screen. It's only a bit quicker, but that time could make all the difference when it most matters.