This article explores the relationship between masculinity and national security. There may be a reluctance to view the values, attitudes, and beliefs associated with a particular version of masculinity as a driver for violence. Yet, the “real man” version of masculinity is consistently correlated with those who in engage in mass violence, mobilized violence, and violent extremism—which present a threat to national security. The “real man” identity is also correlated with significant gender disparities in quality of life including income, health, happiness, and mortality for men. Such grievances represent yet another driver of discontent and violence. National security requires that we recognize and understand potential threats and subsequently work to mitigate those threats. Men in the US military have traditionally been viewed as prototypical of masculine identity and its associated values, attitudes, and beliefs. As such, this version of masculinity represents a unique institutional context to examine the “real man” version of masculinity, and to advance gender equality and overcome the harms that rigid gender roles present to national security.