What is the Body Count in Afghanistan?

The US press has been conspicuously silent about the casualty figures for US forces in Afghanistan. But after a recent death by enemy action, The Washington Post reports the current figures:

...26 American servicemen had been killed by hostile fire and 137 wounded since operations began... a further 28 have died and 115 injured in "non-hostile" incidents..

That's 54 deaths and 252 wounded. But tonight I heard the NBC national news say the total death count was fifty. What are the real numbers?
Update: The Washington Post has scrubbed the article, it no longer contains any reference to 115 injured in non-hostile incidents.