An infantry fighting vehicle (IFV), also known as a mechanized infantry combat vehicle (MICV), is a type of armoured fighting vehicle used to carry infantry into battle and provide direct-fire support. The 1990 Treaty on Conventional Armed Forces in Europe defines an infantry fighting vehicle as "an armoured combat vehicle which is designed and equipped primarily to transport a combat infantry squad, and which is armed with an integral or organic cannon of at least 20 millimeters calibre and sometimes an antitank missile launcher". IFVs often serve both as the principal weapons system and as the mode of transport for a mechanized infantry unit.

Schützenpanzer Lang HS.30, formally Schützenpanzer, lang, Typ 12-3, or SPz lg 12-3 for short, was a West German infantry fighting vehicle developed from 1956 to 1958. It was a Swiss Hispano-Suiza design, with a Rolls-Royce engine. After some early mechanical problems, only 2,176 were built of the 10,680 planned. It was armed with a powerful 20 mm autocannon, a common choice for infantry fighting vehicles of the period.