An ACIIR agent infiltrates a guarded facility, and manages to neutralize a guard from behind with a single blow. ACIIR stands for Advanced Combat Infiltration and Interrogation Research, and is a government funded international agency of highly skilled and trained operatives who infiltrate high-security facilities in order to 1) test the security strength and readiness of the those facilities, and 2) gather and disseminate intelligence back to the agency of any combat, infiltration, or interrogation tactics used in the process.