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Calvin McCullough was a senior officer at SD-6.

After Julian Sark allied himself with SD-6, Sloane explained at a Mission Briefing that Sark had a thorough debriefing with McCullough who determined he could provide credible intel. (Passage, Part 1)

After the End of the SD-6, he spent the last 4 years in Buenos Aires, Argentina, Vaugh and Dixon Came to Question him about his Program, but he knews about being captured and Committs Suicide by Drinking Coffee Spiked with Cyanide.