WordPress works best with simple searches that cut to the chase, e.g. <Dark Heart>.
Here’s what you were looking for, with a tip of the hat to Secrecy News. Even cooler than the non-redacted version is the side by side version showing so very clearly how much of the redaction (90%) is sheer nonsense, the link to that is in the last line of the Aftermath piece directly below.
Secrecy News Extract: Operation Dark Heart Aftermath
Secrecy News on US Classification & 2 Headlines
Secrecy New Extract: DIA Seeks to Classify Reality
Journal: A Case Study in Confused Secrecy
Review: Operation Dark Heart–Spycraft and Special Ops on the Frontlines of Afghanistan — and the Path to Victory
Review: Surrender to Kindness (One Man’s Epic Journey for Love and Peace)