Who are the CID men in catch 22?

In Joseph Heller's "Catch-22," the CID men, or Criminal Investigation Division officers, are portrayed as representatives of military bureaucracy and authority. They investigate alleged crimes and misconduct among the soldiers, often embodying the absurdity and paradox of military regulations. Their presence adds to the novel's themes of absurdity and the often arbitrary nature of justice within the military system. Ultimately, they highlight the disconnect between the soldiers' experiences and the institutional processes that govern them.