The Kase Against Kerry

Based on Kerry's Vietnam record, John takes a shot at the guy (emphasis mine):

So, where am I going with this? John Kerry volunteered to lead sailors in combat. And for whatever reason - when he had a chance to leave combat early, he took it. Not because of disabling wounds. Not because of a death in the family that made him head of household. Not because of orders from higher. No, he apparently was either tired of combat, a rich boy dilettante who had other interests he wished to pursue and this was boring, or because his collection of Purple Hearts was starting to make him contemplate his mortality. Or whatever reason he wishes to advance any given segment of air time.

In other words, does John think that Kerry's commitment to follow through and to duty is lacking?