Have you ever wanted to sell infantry but can't?
I actually came onto this glitch by accident. Here's how to do it:
1. Build a wall. It doesn't matter whether it's sandbags, chainlink, or concrete.
2. Get the unit you want to sell right up next to the bottom, left or right of the wall.
3. Select the sell function below your map display.
4. Get the "$" as close to the unit as possible without the cursor changing.
5. Click the mouse and the unit will disappear and you will receive half of what the unit is worth.
6. To sell vehicles you can do the same as with the infantry or an easier way is to put the vehicle on a repair bay. Get the "$" cursor on the vehicle and it will turn green, you can then sell it.