Tactical gear are items that can hep you fight zombies.   

In order to get tactical gear, you'll need green vouchers.  You use them to open tactical gear chests taht gives you tactical gears.  When you open the chest,  you gradually increase its level.   The higher the level of the chest, the higher rate of receiving more rare gears. 

You can also enhance the gear by colleting the reqiured amount of the same gear. Please note that each gear has it's own stats (such as dodge, regen, life steal, etc.) which can influence the outcome of the battle.