I personally know of past and present police officers, probation officers, corrections offices and military policeman, who had been associates or gang members in their youth, but who left that lifestyle after military basic training. This is a good thing.
This epiphany occurs when the person involved becomes convinced that there are higher loyalties than those to his or her street, neighborhood homeboys, or own selfish interests. This loyalty to a cause greater than oneself is what creates saints and heroes. But it can also create suicide bombers.
Somewhere in the crucible of military basic training, most people make the decision to give loyalty to their nation a higher status, above the loyalty to their race, family, or neighborhood. Only the moral and ethical conscience, generally attributed to religion or the Judeo-Christian cultural training, would be held higher than national loyalty. In other words, only loyalty to God is held above loyalty to the nation.
My friend Hunter "Gator" Glass, former Army 82nd Airborne and Fayetteville gang investigator, recently reminded me that gangs are very much like religious cults, and that to the "true believer" gang member, the gang comes before God, country, race or family. That is the problem. Some gang members in the military do not give over their loyalty to the nation, but remain loyal to their criminal gangs.
This is a good way to think about criminal gangs in the military. They are like a strange religious cult that covertly exists within our national military. It is a fifth column. Its loyalty is to its own faith and hierarchy. The gang's "code of conduct" is not in agreement with our nation's cultural norms or any military code of conduct. When the interests of the nation and the gang are in conflict, the "true believer" will choose the interests of the gang over the nation. He will act to benefit the gang. This will occur even if this means killing fellow soldiers, sailors or airmen.