(FOXNEWS) — Their identities have been a well-guarded secret, known only to their high-powered lawyers and a handful of House lawmakers and staff. But now Fox News has learned the names of the self-described Benghazi “whistleblowers” who are set to testify before a widely anticipated congressional hearing on Wednesday.

Appearing before the House Oversight and Government Reform Committee will be three career State Department officials: Gregory N. Hicks, the deputy chief of mission at the U.S. Embassy in Libya at the time of the Benghazi terrorist attacks; Mark I. Thompson, a former Marine and now the deputy coordinator for Operations in the agency’s Counterterrorism Bureau; and Eric Nordstrom, a diplomatic security officer who was the regional security officer in Libya, the top security officer in the country in the months leading up to the attacks.

U.S. Ambassador Christopher Stevens and three other Americans were killed in the Sept. 11, 2012, attacks on the U.S. outpost in Benghazi, Libya.

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