trials confirmed the calculations of RCN staff members; the HU2K was substantially heavier than promised, hampering performance and rendering it incapable of meeting RCN requirements, even using a proposed upgraded engine. The Sea King was ultimately chosen for production on 20 December 1961. The first of 41 helicopters would be delivered in 1963 carrying the designation CHSS-2 Sea King. Airframe components were made by Sikorsky in Connecticut but most CHSS-2s were assembled in Longueuil, Quebec, by United Aircraft of Canada (now Pratt & Whitney Canada), a subsidiary of Sikorsky's parent company, United Aircraft. On 27 November 1963, the new landing platform aboard was used for the first operational destroyer landing of a production CHSS-2. Upon the unification of Canada's military in 1968, the CHSS-2 was re-designated CH-124. In the 1960s, the RCN developed a technique for landing large helicopters on small ship decks, using a 'hauldown' winch (called a "Beartrap"), earning aircrews the nickname of "Crazy Canucks". The Beartrap allows recovery of the Sea King in virtually any sea state. In 1968, the RCN, Royal Canadian Air Force (RCAF) and Canadian Army unified to form the Canadian Forces; air units were dispersed throughout the new force structure until Air Command (AIRCOM) was created in 1975. In August 2011, the Canadian Forces reverted to the former structure of the Royal Canadian Navy, Canadian Army and Royal Canadian Air Force. Operational service The Sea Kings were assigned to the former destroyers (2 per ship with total of 6), s (1 per ship with total of 12), and the former replenishment ships (3 per ship with total 6) as a means of extending the surveillance capabilities beyond the horizon. When deployed, each Sea King is accompanied by several crews. Each crew consists of two pilots, a Tactical Coordinator (TACCO), and an Airborne Electronic Sensor Operator (AESOp). In order to find submarines, the Sea King's sonar uses a transducer ball at the end of a 450-foot cable. It can also be fitted with FLIR to find surface vessels at night. The CH-124 has undergone numerous refits and upgrades, especially with regard to the electronics, main gearboxes and engines, surface-search radar, secure cargo and passenger carrying capabilities. In 2013 the CH-124 fleet averaged 9–14,000 flying hours, while Sea Kings of other fleets go as high as 40,000 hours. Although the CH-124 had frequent technical issues, none are serious, and they could maintain an 87 percent