M109 in the Swiss Armed Forces

Four systems were manufactured before the program was suspended due to technical difficulties and financial considerations.

Over time, a total of 581 M109 were ordered, and today, 133 M-109 KAWEST WE are in service 146 Pz Hb 66 ("15.5 cm Panzerhaubitze 66"), purchased with the armament program 1968, and introduced from 1971.

[3] 120 Pz Hb 74 ("15.5 cm Panzerhaubitze 74") purchased with the armament program RP 74, and introduced from 1974 to 1978.This batch is made of the M109A1B with a L-39 calibre cannon.

[10] 133 Pz Hb KAWEST WE are in use, 90 used in five artillery divisions, and 43 used in basic training,[12] 62 were sold to other countries, and few variants remain in museums.

The armament program "Artillerie Wirkplattform und Wirkmittel 2026" for the replacement of the M109 KAWEST WE is ongoing.