After the war Valentin again served as a parachute instructor and directed his attention toward his lifelong ambition. While still in the French Army he developed the jumping technique known as the "Valentin position", allowing him better control of his movements in the air.
Following the war, Valentin resumed his work as a parachute instructor and refocused on his life's goal. Concurrently, within the French Army, he created a specialized jumping method called the "Valentin position," which gave him better command over his movements in flight.