As I published in the previous, all the existing categories were archived and became 3 categories Fireteam (Z) which includes all those who kill zombies:

Fireteam (H) in which terrorists are killed:

Fireteam (N-R) in which the ninjas/robots are killed:

In Fireteam (Z) the Old Weapons Subcategory is because the items can no longer be obtained (Grenade Launcher/Fire/Smoke)-(Minigun/Legion)