I'm trying to remember the name of an anthology of short stories about humans fighting an alien, insect-like race. I read the book in the late 1980s. There were about 10 stories.
One of the stories featured an imprisoned general who led an army of prisoners to turn the tide of the war. This was a very good story. It was centered around a general who was sent to a military prison for disobeying an order. When he arrived at the prison he observed the inmate population and befriended key individuals to help organize and rally them into a fighting unit. The prison was requested to help fight and turn the tide of the war. The prison army was feared by the aliens because the inmates fought with great virtuosity and no fear.
Another story was about a soldier who tested weapons, found many of them to be defective, and tried to find out why. The weapons were defective because some weapon manufacturers were in league with the aliens and this was discovered by the story’s protagonist. Agents of the crooked manufacturers also killed the protagonist's girlfriend.