The RG-31 has a V-Shaped hull in order to defend against IED attacks, the principle of which being that the explosion would be directed outwards (I don't know if this is the right term). That being said as backwater as the Taliban/other fighters are - they are still smart and are able to put together sophisticated bombs and weaponry in order to overcome the technological advantage that we have. It is simply impossible to defeat every threat that we are faced with overseas unfortunately.
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