Session Abstract: The day of a breach, commonly referred to as "cyber game day," is not the opportune moment to determine your ability to effectively counteract an attack and execute an effective incident response. One must adopt an attacker's mindset as the sole means of honing their craft. It is imperative to assess one's capabilities prior to the actual breach proactively. Learn how to rigorously challenge and evaluate the efficacy of your preventive and detection measures in the face of real-world attacks on a continuous basis.