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Nigeria since independence in 1960 has had several leaders. Some of the leaders were military while others were civilians. Each has its leadership style. Every nation state, Nigeria inclusive has its national security challenges. Leaders addressed national security issues differently based on their perceived evidences and ideology. With the use of primary data, this research study found that successive leaderships in Nigeria have been able to maintain the national security as a whole but not without some nagging challenges of insecurity. This study recommends monitoring, evaluation and sustainability of government programmes and projects to enhance the national security.