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 returned to his role as a parachute instructor and rekindled his pursuit of his lifelong ambition. At that time, while still serving in the French Army, he developed an advanced jumping technique known as the "Valentin position," which provided him with greater control during aerial maneuvers.