On the North side of Mehrabad airport, connected with a taxiway that also runs past the maintenance complex, is the so-called aerospace exhibition. This Caribou is thought to be one of two used in support of the US projects Dark Gene and IBEX which was basically spying on the Soviet Union from Iran. The C-7 was used to supply the forward deployed operatives at their listening posts.

This is former C-7A 61-2388 that was used by the CIA in Iran for flights along and across the Soviet Union border under project Ibex. For quite a while, this aircraft was in the museum in its original colour scheme and carrying Iranian Air Force markings and serial 553. Unfortunately, by early 2008 it had been repainted in this terrible colourscheme, temporarily with registration "EP-RAJ", but now without any registration. The aircraft carries texts referring to the Hekmat Saba Insurance company, presumably because that company sponsored the recent paint job.

Operated by Southern Sky Inc. in Iran in the 70, abandoned there after the change in Government. Now preserved in Tehran. Painted as Sina Insurance Company.

B-853 was owned by Air Asia and operated by Air America on behalf of the CIA in South-East Asia. In 1968 it passed to the USAF as 61-2388. From 1973 to 1979 it was used to supply Ibex (CIA) surveillance stations in Iran. After the Iranian revolution, c/n 52 became an exhibit at the Tehran Aerospace Museum.