Cover-up [the Army's secret investigation of the massacre at My lai 4

The Pulitzer Prize winner who first disclosed the massacre at My Lai 4 uncovers the full story of how those involved - from private to general - kept it secret. What he reveals is shocking - from the amorphous but very real "West Point Protective Association" to the fact that an extensive but closed investigation by the Army itself covered up another massacre by the same unit on the same morning.