Lisa's Conquer The Eliminator task (spoiler)
In case anybody is wondering what the possible prizes are.....
training dummy, bomb shelter, mini nuclear warhead, and 5 chain link fences. The mini nuclear warhead is the only thing worth saving, all the other junk can and should be sold immediately. This is similar to the rocket launcher task, where you will get junk most of the time, but every once in a while, you will get a mini nuclear warhead, which is worth 2.25% bonus