A referendum on the military was held in Switzerland on 1 December 1940. Voters were asked whether they approved of amending articles 103 and 104 of the federal law that detailed the organisation of the Swiss military. The proposal was rejected by 55.7% of voters.
Background
The referendum was an optional referendum, which only a majority of the vote, as opposed to the mandatory referendums, which required a double majority; a majority of the popular vote and majority of the cantons.
References
Swiss military referendum, 1940 Wikipedia(Text) CC BY-SA