Capitalism is simply the economic system for the extraction of wealth from the poor to the wealthy where once it was from the poor to the monarch and the artistocratic class (ie feudalism). That's it. Someone will be tempted to pipe up with something about "free markets". Markets are commerce. They happen in every economic system.
So you see a lot of people flounder in this area in a way that is curable with the barest introduction to Marxism, specifically the labor theory of value [1].
So profiteering off government contracts is nothing more than the extraction of wealth from the poor to the rich via the government. Yet you'll find many who say we're simply not doing enough capitalism.
This is also why culture war issues are manufactured: to stop the development of class consciousnes and solidarity. It is an intentional distraction so you won't pay attention to the wealth transfer going on through tax cuts, deregulation and, of course, government contracts.