During each World War, the Swiss military mobilized to ensure that Switzerland would not become one of the participants. Since Swiss military service is compulsory for all men between the ages of 18 and 48, this inevitably created financial hardship for many of those called up for active duty. During each war, individual military units issued fundraising labels that could be placed on mail to indicate charitable support. Since those on active duty enjoyed free-franking privileges, they often placed these military stamps on their mail in lieu of regular postage. These stamps were duly cancelled by the field post offices.

World War I issue; Protection of the St. Gotthard Pass

World War II issues of Provisioning Units