Risk Taking Behavior

I've thought a lot about the military lately. And the types of people who join it.
I used to have a hard and fast rule of no dating military men (well, when I was single I did) because they are generally untrustworthy in relationships. My logic before was based on the theory that military men are cheaters because they are surrounded by men who encourage or tolerate the behavior.
Disclaimer: I know this is not true for all men. I also have some amazing male friends who are in the military who would never cheat. I've just always assumed they were the very, very rare exception, not the rule.
Also, I always assumed that many military women, especially Navy girls, are promiscuous. I never like to call women "sluts" or "whores" because the same behavior is never painted in the same light when it's men who exercise it. Regardless, I did have a conception of women in the military being women who like to sleep around with the men they serve with (unless they were lesbians, of course).
Back to my theory, I've come to realize in the last year or so, that military men cheat not because they are surrounded by their buddies who tolerate it (well, not solely) but because MOST people who join the military enjoy indulging in risk-taking behaviors. This explains why women in the military have such a bad rep for being slutty and the men have such a bad rep for being cheaters.
I understand that cheating is a choice that no one forces a person to make; however, I think it's interesting as to why certain groups of people are "known" for their extramarital activities. Soldiers, sailors, marines, etc., have always been known or thought of as "womanizers" and why is that? Because the act of being in a military force encourages risk taking. Soldiers who are honored for bravery and courage took risks to earn those accolades. Marines who undertook the greatest invasions accepted overwhelming risks to accomplish the mission. The Navy SEALS who killed Bin Laden took enormous risks that would have reverberated globally if they failed.
It's interesting though, the military strives to embody a set of values that its members do not live up to. The military pushes its men and women to be honest, selfless, and loyal; all traits that do not fall in line with infidelity. Yet, even as men and women in arms move away from using drugs, punish those who engage in reckless violence in combat, work to eradicate sexual harassment and assault, they still cheat regularly. Using drugs is risky. Killing civilians is risky. Harassing a coworker is risky. Yet, these things are falling out of fashion.
But you might say, well, all of those actions are punishable by military and civilian law. True. But military justice makes infidelity (by married service members) a crime too! Why does the military just look the other way? Why do soldiers or sailors who would report drug use not report an unfaithful spouse? Why do the men (and women) who profess their dedication to a higher set of values and preach those values to their subordinates choose to betray the one person they promised to be loyal to? Why does a leader who would die for his or her comrades choose to sleep with someone who is not their spouse?
I certainly don't have an answer, but in the end, I really believe that infidelity in the military is inherently linked to the type of person who is willing and ready to accept the risk of serving in the military...