What if the perks were actually pieces of armor that shows itself on each character, thus letting the enemy be aware of what perks you have equipped. They did this in Black Ops 1 via the blue perks, but I figure it should be applied with any perk. However, depending on which perks a player equips, the effects will be directed towards specific parts of the body.
Please Note: Just like in Ghosts, a player has a choice to equip any number of perks within the same tier. This allows for more freedom of choice without restriction
Entire Body (head, back, shoulders)