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Something else it doesn't appear they took into account is the combat history of the unit. A unit that was in the thick of things and saw a lot of action has a higher occurrence of PTSD and depression, both of which can lead to suicide. So, it may not be that the unit is experiencing increased suicide attempts because others in the unit have, it may be they are experiencing it because they have a lot of PTSD due to seeing heavy combat.
KN,
But these aren't lemmings, they are highly trained soldiers who think for themselves. I'd like to look into the history of the units and see if there is something else at play here. I just don't think that humans will consider suicide just because someone they know did. In that case, half the Army and Marines are susceptible.
I understand that. I was talking sarcastically there. The rate of suicide is usually high with soldiers after they have come back from combat zones and can not deal with the changes in their lives and the way they look at their family and loved ones. Things change and without a good outlet to talk it out with they feel that is their only recourse.