Senator Hagel's Vietnam analogy


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