Posted by PorkChopExpress
Exactly.
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More to it than that.
The army now is Mechanized. You ride in a vehicle until you have to dismount and get on foot. So the time moving around with your rifle on the ground is much less. In the mountainous parts of Afghanistan you go out for relatively short combat patrols where contact is extremely likely.
In Vietnam you did move around a lot more on foot and for much longer periods of time. You would go on missions for days and contact was not really very likely most of the time. So as a result soldier get tired and they get lax because of the boredom.
The time on foot and the likelihood of contact greatly influenced it.
Also, fancy slings and things like the front grips can make it alot more comfortable to hold a weapons properly for long periods of time. Trust me, holding a rifle without a frontgrip for extended periods of time can get really uncomfortable for your wrist.