Check the listing for details. USAF C-123 FLIGHT EXAMINER 311th AIR COMMAND SQUADRON, VIETNAM WAR PATCH. Condition: Used, Made in Unknown. Listed at 9.85 USD. TheC-123 was a widely used aircraft throughout the Vietnam war, primarily used for the landing of US Special Forces units. The aircraft with powerful engines was capable of short landing and take-off operations into restricted jungle areas.