In early March 1943, SOE participated in a General Headquarters field exercise known as “SPARTAN”. Here they planned to test the “Jedburgh” concept, and OSS was invited to send observers. SO Branch sent Captain John Bross to observe the exercise. Another representative of SO, Captain Canfield , participated in the exercise at the SOE Control and Dispatch Center. Obviously, the concept proved out. The Jedburgh Project was green-lighted. Interesting little bit of history that the Proof of Concept exercise was named Spartan, no? Carry on.