Question: Who developed the bomber that was shot down and killed Lieutenant Wally Marais?

<P0-S0>  During the operation, a SAAF Canberra bomber was shot down, killing Lieutenant Wally Marais and Second Lieutenant OJ Doyle. <P0-S1> Operation "Rekstok" (Operation Horizontal Bar) was a series of South African raids into southern Angola on 7 March 1979 during the South African Border War and Angolan Civil War. <P0-S2>  The operation lasted six days. <P0-S3>  Operating from Ovamboland, SADF forces entered Angola and attacked SWAPO bases at Mongua, Oncocua, Henhombe and Heque. <P0-S4>  The SADF conducted Rekstok concurrently with Operation Safraan and later performed Operation Sceptic. <SEP> <P1-S0> The May 2010 Kabul bombing occurred on May 18, 2010, in Kabul, Afghanistan. <P1-S1>  Eighteen people including five US soldiers and a Canadian soldier were killed and fifty-two were injured when a NATO convoy was targeted by a Taliban suicide attacker. <P1-S2>  It was the deadliest attack against NATO forces in Afghanistan since September 2009 when six Italian soldiers were killed by a suicide bomber. <P1-S3>  Two full colonels and two lieutenant colonels were killed in this attack making it the deadliest attack against ranking officers in Afghanistan. <P1-S4>  With this attack the total number of Americans killed in Afghanistan crossed one thousand. <SEP> <P2-S0>  These were the 163 Army Cooperation Squadron in March flying Bristol Bolingbrokes and Hawker Hurricanes, in May the 160 Bomber-Reconnaissance Squadron was added flying Cansos from Sea Island BC (before moving to Yarmouth NS in July) and the 166 Communication Squadron formed in September flying various types. <P2-S1>  On 10 March, Pilot Officer J. O. Patten destroyed a balloon near Saltspring Island, British Columbia. <P2-S2>  By the end of the war the command would involve some twenty squadrons when the last units to join were added in 1943. <P2-S3>  On 7 July 1942 a Bristol Bolingbroke pressed home an attack on the Japanese Submarine Ro 32 the pilot F/Sgt. <P2-S4>  Patrol activity was joined by the Operational Training Schools (OTS) operated by Number 4 Training Command of the BCATP. <P2-S5>  By January 1943 Western Air Command had expanded to include many bomber, fighter and operational units under its control. <P2-S6>  In addition to the new squadrons, new aircraft types came on line replacing the command's remaining Supermarine Stranraers and Blackburn Sharks with Canso's and the Bolingbrokes and Beauforts with the Lockheed Ventura. <P2-S7>  P.M.G. Thomas of No. 115 Squadron RCAF then led American Destroyers to sink the damaged submarine. <P2-S8>  With the Japanese threat after Pearl Harbor it grew rapidly and played a critical role in fighter and anti-submarine operations in Canadian and American waters during the Aleutian Islands Campaign. <P2-S9>  By the end of September 1944 RCAF 5 O.T.U. had grown to sizeable force of some 87 aircraft including 38 B-24 Liberators, 35 B-25 Mitchells, 5 Bolingbrokes, 8 P-40 Kittyhawks and a single Norseman. <P2-S10>  When Canada declared war against Germany in September 1939 the command consisted of only five squadrons. <P2-S11>  Countless training missions and operational patrols bolstered the air activity over the coastal areas but there was not much action until RCAF Western Command was on the look out for General Kusaba's Fire Balloons that the Japanese called the Fūsen Bakudan Campaign. <P2-S12>  Four of them equipped with obsolete aircraft including a bomber squadron with aircraft from the Great War and there were no fighter aircraft at all for its only fighter squadron (113 Fighter Squadron was thus disbanded). <P2-S13>  Within several months almost all the flying squadrons would be completely stood down. <P2-S14>  They were the No. 3 OTS flying the Canso and Catalina and No. 32 OTS with Ansons, Beauforts and Swordfish at Patricia Bay. <SEP> <P3-S0> The English Electric Canberra is a British first-generation jet-powered medium bomber that was manufactured during the 1950s. <P3-S1>  Amongst the performance requirements for the type was the demand for an outstanding high altitude bombing capability in addition to flying at high speeds. <P3-S2>  These were partly accomplished by making use of newly developed jet propulsion technology. <P3-S3>  It was developed by English Electric during the mid-to-late 1940s in response to a 1944 Air Ministry requirement for a successor to the wartime de Havilland Mosquito fast-bomber. <P3-S4>  When the Canberra was introduced to service with the Royal Air Force (RAF), the type's first operator, in May 1951, it became the service's first jet-powered bomber aircraft.