Introduced in the early 1960s, the M108/109 marked the transition from open-topped to fully enclosed self-propelled artillery. Developed simultaneously, the M108 and M109 went from experimental to "standard" classification in July 1963. Production of the M108 was concluded within months, as its 105mm gun was found to be less well suited than the M109's 155mm cannon. Both vehicles saw service in Vietnam. In 1972, the M109s were rearmed with longer...
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