Senator Hagel's Vietnam analogy

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Despite his service in Vietnam, Sen. Hagel's comparison of Iraq to Vietnam is incorrect and is a harmful influence on public opinion and troop morale.  What's up with this guy?  Is this just posturing as he contemplates a presidential run?
 
Frederick Kagan from the AEI  seems to be very logical in refuting Hagel's stance, in this LA Times op—ed. 
 
Hat tip: Michael