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Benno-Claude Vallières (born Bention Grebelsky'; 28 July 1910 – 4 December 1989) was a French industrialist who spent nearly all his career in aircraft manufacturing with what became Avions Marcel Dassault.

Early life
Grebelsky grew up in Saint Petersburg, Danzig, and Paris, where he arrived in 1926. He entered the Supaéro aeronautical engineering school after only one year of of post-high school preparation instead of the usual two three, and graduated in 1932.

Early career
Grebelsky first worked for Dewoitine and switched to Avions Marcel Bloch in February 1934. Marcel Bloch (who later changed his name to Marcel Dassault) placed him in charge of assembling the Bloch MB.480 floatplane. In 1936, following the nationalization of Avions Marcel Bloch and its merger into SNCASO, he became director of its Mérignac factory, where he managed the production of the MB.174 and MB.175 reconnaissance bombers.

Second World War
After the armistice in 1940, Grebelsky joined the Cannes technical team of SNCASE, where he worked on the Block MB.161, renamed SE.161 transport aircraft. Although the trials of the MB.161 were all performed with a German officer onboard, Grebelsky and a colleague planned to gag the officer and fly the plane to North Africa, safe from the Wermacht. Unfortunately, a tire blew out on take-off and they had to abort their plan. In December 1942 he entered Spain, hoping to join Free-France forces, but he was caught and incarcerated in Barcelona and later Cartagena. He later managed to reach England, where he joined the Free French Air Force. In June 1943 he joined the British SAS and took the name Claude Vallières. He took part in several SAS operations in France and in SAS Operation Amherst, for which he was parachuted (with Henri Déplante) in the Netherlands (only half of the unit returned). He received the British Military Cross in 1945, as well as the French Croix de Guerre.

Later career
Grebelsky returned to work in 1945, the day after the return of Marcel Dassault from the Buchenwald concentration camp.