Editing M109 howitzer (section)

==== M109 66/74 ====
{{Main|M109 in the Swiss Armed Forces}}
The M109 (Pz Hb) 66/74 is a Swiss upgraded M109 (Pz Hb 66) to M109A1B (Pz Hb 74) standard.

Switzerland purchased 146 M109 under the armament program 1968, and introduction of the howitzer started in 1971.<ref name="Pz Hb 66">{{Cite web |title= Panzerhaubitze 66 M-109 / L-2315,5 cm Pz Hb 66 - Panzerhaubitzen - Raupenfahrzeuge {{!}} militärfahrzeuge.ch |url=https://militaerfahrzeuge.ch/unterkategorie_13_31_355.html |access-date=2023-07-28 |website=militaerfahrzeuge.ch}}</ref> All vehicles received upgrade to M109A1B (Pz Hb 74) standard and were delivered from May 1977 to February 1979.<ref name="Pz Hb 66/74">{{Cite web |title=Panzerhaubitze 66/74 M-109 / L-39Pz Hb 66/74 - Panzerhaubitzen - Raupenfahrzeuge  |url=https://militaerfahrzeuge.ch/unterkategorie_13_31_475.html |access-date=2023-07-28 |website= Militaerfahrzeuge}}</ref>