Counter-terrorism (also spelled counterterrorism) is the practices, tactics, techniques, and strategies that governments, militaries, police departments and corporations adopt in response to terrorist threats and/or acts, both real and imputed. The tactic of terrorism is available to insurgents and governments. Not all insurgents use terror as a tactic, and some choose not to use it because other tactics work better for them in a particular context. Individuals, such as Timothy McVeigh, may also engage in terrorist acts such as the Oklahoma City bombing.