You are correct in that the tightest personal bonding is in groups of four - where they 'do it for their mates'. The better units have strong unit cohesion where they 'do it for the regiment'.
There are always those who keep apart and do not bond with others to the extent that they will not place themselves at risk for another. These people are always looking out for No 1 and to hell with the rest. Easy for these people to decide that combat exposure is not for them and they will be able to produce all manner of excuses as to why they are not prepared to expose themselves to the danger of combat. Lack of belief in the 'cause' is the usual one... but never is there an admission that there is a lack of courage.
Now before I hear that soldier X, with a prior record of courageous combat exposure, is one who is now attempting to avoid a combat tour let me remind all of Lord Moran's findings (in his 'must read' book The Anatomy of Courage) that, in summary, courage is drawn from a well that is never replenished.
The best advice to the heroes who find their 'well' of courage used up is to get out of the service rather than stay and be exposed for the real reason they need to avoid combat exposure. Nothing is simple.
... oh yes and in addition. This 'problem' can spread like a cancer from individuals to groups as with the US experience of combat avoidance/refusal in Vietnam. Kill it before it spreads.
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