1. Unorthodox Methods: Callahan's methods are considered unconventional and often go against standard police procedure. He is willing to take risks and use unorthodox tactics to catch criminals, even if it means bending or breaking the rules.
2. Disregard for Authority: Callahan often clashes with his superiors and refuses to follow orders if he believes they are compromising his mission. He is unafraid to challenge authority figures and does not hesitate to take matters into his own hands.
3. Questionable Tactics: Callahan's tactics are sometimes questionable and can be interpreted as morally ambiguous. He resorts to violence, intimidation, and unconventional interrogation techniques to get information from suspects or pursue criminals.
4. Use of Excessive Force: Callahan is not afraid to use excessive force if he believes it is necessary. He is often seen using firearms and unconventional weapons to subdue criminals, which can be considered "dirty" or brutal.
5. Moral Ambiguity: Callahan's character exists in a morally ambiguous gray area. He is not a conventional hero, and his actions sometimes raise ethical questions. However, his strong sense of justice and dedication to his job make him a complex and compelling character.
Overall, the nickname "Dirty" Harry reflects Callahan's unconventional methods and questionable tactics that set him apart from traditional law enforcement officers.