Chromium

A rare, silverish metal. Looks fancy.

Drops

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Supply Boxes
Corporal - Automated Arsenal

Mission Rewards
-Swamp Sharks

Usage
Chromium is used in crafting gear, most prominently guns and knives.

Farming
Go to Skyscraper A17, accessible from the 3rd rank, Corporal.

The first piece of chromium is in a box to the right as you're going down the left side of the skyscraper, which is near a flamethrower unit resting by the entrance of a room.

The second piece chromium is just after the first one, if you go down the path the nearby flamethrower unit is at, you will come across it inside a room.

A total of two pieces of chromium in about under a minute.

Do take note that the sentry guns also drop chromium. Most gear that require chromium also requires steel, which can be obtained from the various runner units strewn about the map.