The Panzer 68 was a Swiss main battle tank developed by the Eidgenoessische Konstruktionswerkstaette in Thun in the late 1960s, and was the main tank of the Swiss Army until the late 1990s. History The Panzer 68 was based on the Panzer 61, which initial development dates back to 1951. The development started immediately after the successful introduction of the Panzer 61. Improvements consisted of wider tracks, stabilized gun, and the introduction of a second machine gun instead of the coaxial 20mm gun of early Panzer 61 models. In 1968 (hence the name) the Swiss parliament decided to buy 170 vehicles. Deliveries of the Panzer 68 started in 1971. In 1977 a second batch was manufactured. In the years between 1978 and 1983, a third and fourth batch followed. The last two lots were called either AA3 and AA4 or Panzer 68/75. The most important change was the introduction of a bigger turret. The Austrian Army showed some interest in the Panzer 68 in the late 1970s, but decided not to buy the model when the deficiencies of the system became public. (see below) In 1992 the Panzer 68 underwent one more modernization program which introduced a new fire control system which was on a par with the system used in the new Panzer 87 (license-built Leopard 2) This new, improved version was called Panzer 68/88. Despite the improvements in the Panzer 68/88, the model was relegated to secondary tasks after the arrival of the Panzer 87. All Panzer 68 models were retired in the early years of the new millennium. The responsible authorities tried to sell some 200 to the army of Thailand, but the deal never went through and therefore, the remaining vehicles were demilitarized and sold for scrap in 2005. Some Panzer 68s can still be seen in military museums around the world. Technical problems During the summer of 1979, the Weltwoche, a Swiss weekly, published an article regarding the shortcomings of the Panzer 68 that led to a scandal and, allegedly, to the resignation of the minister of defence, Rudolf Gnägi. In this article, the then chief of armoured forces of the Swiss Army came to the conclusion that the Panzer 68 was "not fit for combat". A group of experts that was commissioned to produce a report on the matter listed dozens of technical problems. Among others, the nuclear, biological and chemical (NBC) protection was