Project Cedar (also known as Operation Cedar) was a World War II project to deliver short-range aircraft from the United States to the USSR via Abadan, Iran in the Persian Gulf.
The project was initiated before the United States' entry into the war, and a base was established on Abadan Island in March 1942. Oil tankers, returning from delivering oil to the United States, would take Bell P-39, Curtiss P-40, and Douglas A-20 parts to Abadan, where they were assembled into aircraft and flown to Russia. The 82nd Air Depot Group was part of Project Cedar.
Another similarly secret operation, Project 19, was set up in Eritrea to repair RAF aircraft.
References
Operation Cedar Wikipedia(Text) CC BY-SA