EA08 has a good chance of letting you survive a chest shot from a scope with 1 hp, even if you are a scope, the chance is decent to tank even pgm or frf2 at closer ranges, as riflemen you are even more likely to tank
AA07 is the thing thats generally good against most of pointman eweapons and rifles, especialy as the range gets higher and these guns lose even more damage and penetration
basicaly AA07 is a mini-Iyan, an anti-m4 armour, the only things that really get through are veresk, para and m14 ebr (only at closer ranges though), but even EA08 wont stop these at close range, while at range AA07 still has decent chances (at about 25 meters it can take as many as 5 chest shots with para to kill on AA07 since when it loses the massivedamage it also loses penetration)
vs pointman and RM = AA07
vs sniper = EA08
Why do Zombies want your Brains? Because you do not use them anyway!