3-60. OPSEC is the properly implemented measures and countermeasure that protect EEFI from enemy or adversary observation and collection. OPSEC is fully integrated into all plans and orders, and begins during receipt of the mission. The OPSEC planner begins to identify EEFI by analyzing the enemy’s capabilities, with special emphasis on the enemy’s ability to conduct reconnaissance, surveillance, intelligence gathering, and information collection directed at the unit. Once the EEFI are initially developed, the OPSEC planner focuses on protecting this information during the remaining steps of the MDMP and refining the process. OPSEC measures and countermeasures are developed using the risk assessment matrix to determine OPSEC vulnerabilities and residual risk associated with each measure or countermeasure.