and eighth being a special purpose version with terrain-following radar and a cargo-dropping hatch for low level air-drops, designed by and delivered to CIA-associated companies. Operational history In April 1967, two On Mark Marksmans were transferred from Intermountain Aviation, an air service related to the US Central Intelligence Agency, to Air America, another air service connected to the Agency. The official role of these aircraft as stated in the specifications provided to Air America from Intermountain in March 1967 was "Aerial resupply, [and] low level penetration." Both aircraft had been highly modified with a variety of navigation and other electronic equipment for this role. Between June and October 1967, the first aircraft, re-registered from N900V to N46598, conducted low level nighttime supply drops to CIA related forces in Laos during the so-called "Secret War". The program was discontinued because the aircraft was too fast for accurate drops even with the special onboard equipment, and looked too much like a type of strike aircraft known to operate in the theater. This was cited as often causing forces on the ground to be wary of turning on their marking lamps. The aircraft was damaged on takeoff at Takhli Royal Thai Air Force Base after being transferred to Overseas Aeromarine, Inc. The second aircraft, officially re-registered from N800V to N67623, was intended for the same role but never used. Both aircraft were initially painted in Insignia Blue, plus white trim areas outlined with black pinstripe that led the type to be nicknamed "the Blue Goose." In the end, both aircraft were handed over to the 1198th Operational Evaluation and Training (OT&E) Squadron at Norton Air Force Base, San Bernardino, California, a unit known for alleged participation in agent dropping and other clandestine missions in Southeast Asia (Project Heavy Chain). The Squadron evaluated the two Marksmen, but apparently found no use for them and scrapped both aircraft, which suffered from a chronic Invader issue of nose gear failure. Variants Executive Basic conversion of the A-26 as an executive transport. Marketeer Further developed executive transport conversion of the A-26. Marksman Pressurized executive transport conversion of the A-26. Marksman ABasic conversion with nose section, hydraulically-operated airstair and toilet compartment. Marksman BSimilar to the A model, with Pratt & Whitney R-2800-83AM-4A Double Wasp engines driving Hamilton Standard 33E60 high-activity propellers, 2x tip tanks, DC-6 wheels and brakes with chromium-plated landing gear. Marksman CSimilar to the B model,