Elite Gear Roadmap

The Elite gear consists of 6 stages, and each stage gives you different elite gear for your characters. Here are the list:
Stage 1 - Weathered journals for peacekeepers - Zombie stage
Stage 2 - Tools waistpacks for rebels - Human enemy stage
Stage 3 - Topographic maps for leaders - Zombie stage
Stage 4 - Gasmask for soldiers - Human enemy stage
Stage 5 - Campstove for citizens - Zombie stage
Stage 6 - Alpenstocks for hunters - Human enemy stage.

Completing the last stage also gives you a benie and a flak.

See my blog on defeating zombie stage, so I only explain the human stage here. The enemies are blue and reds, so use your blue and yellow characters to defeat them. As usual, the red enemies tend to have more health, so I recommend killing the blue characters first.

My way to complete the human stages:
Use three yellows and three blues.
Bring grinder stone for the yellows, blue vial, red vial, and high replenish.

Strategy:
Use the grinder stone, gives the reds blue vial and the blues red vial to tear their defenses. strike hard the blues to kill them.
When theres only 1-2 reds remaining, accumulate your char AR for the next wave.
If you have "Jesus" as one of the teammate, make sure to make his AR ready before killing the last person and go for the next wave. In the next wave, use grinderstone and use red vials on the blues, then do "Jesus" AR to kill all the blues instantly.