In the early 1960s, Germany, the UK and the US agreed that they had a requirement for a new 155 mm towed field howitzer. Germany and the US wanted to replace their 155 mm M114 howitzers (covered in detail in a separate entry) and the UK wanted to replace its 5.5 in guns. In the end, the US went on to develop the 155 mm M198 which has no APU. Germany and the UK agreed to develop a new weapon, which became known as the FH-70.