In Catch-22, capitalism functions to maximize profit, and everyone works to increase their share of the profit. Milo shows that everyone, regardless of nationality, race, or gender, responds to money. In the novel, greed drives men to disregard their morals, and to betray their countries and their friends. One of Heller's main points is that capitalism, bureaucracy, and government are often intertwined, and nearly everyone is motivated by greed.
As both a soldier and a capitalist, Milo demonstrates that greed is embedded within the military and that capitalism cannot be separated from other American institutions.
As a symbol of capitalism, Milo could be seen as a positive force of the American government.