with their own idea of a smaller and lighter gunship, noting that Lockheed had little experience in developing rotorcraft and correctly predicted that it would encounter considerable difficulties. Bell employee Mike Folse played a key role in developing this new gunship, which he intentionally based around the existing UH-1 on the rationale that, while the Army could not purchase a completely original helicopter without a formal design competition, the service was able to procure a modification of an aircraft that was already in its inventory without invoking such hurdles. This initiative quickly caught the approval of Bell's senior management team. In January 1965, Bell elected to invest $1 million to proceed with the concept's detailed design. Mating the proven transmission, the "540" rotor system of the UH-1C augmented by a Stability Control Augmentation System (SCAS), and the T53 turboshaft engine of the UH-1 with the design philosophy of the Sioux Scout, Bell produced the Model 209. It largely resembled the "Iroquois Warrior" mockup, particularly in its cockpit and tail book; in broad visual terms, there was relatively little shared between the proposed design and the UH-1. Despite appearance, much of the Model 209's major elements, such as the tail rotor and much of the dynamic systems, were identical. Roughly 80 percent of its components already had existing Huey part numbers. On 3 September 1965, Bell rolled out its Model 209 prototype, and four days later it made its maiden flight, only eight months after the project's go-ahead and slightly under budget. This first flight was witnessed by around 20 US Army officials, the service having had no awareness of the project's existence prior to this, and rapidly drew the government's attention. One early test flight was met with a reportedly enthusiastic visit by US secretary of defense Robert McNamara. Bell claimed at this phase of the project that production units could be ready for service within one year As the Vietnam War proceeded, pressure accumulated in favor of the Model 209. Attacks on US forces were increasing and, by the end of June 1965, there were already 50,000 US ground troops in Vietnam. 1965 was also the deadline for AAFSS selection, but the program would become stuck in technical difficulties and political bickering. The US Army needed an interim gunship for Vietnam and it approached five separate companies with its request to provide a quick solution. Submissions came in for