Switzerland
Practice Relating to Rule 106. Conditions for Prisoner-of-War Status
Switzerland’s Basic Military Manual (1987) states:
In order to increase the protection of the civilian population against the effects of hostilities, combatants must distinguish themselves from the civilian population by wearing a uniform, before and during an attack.
The manual further states:
All members of the regular armed forces wear a uniform … The uniform allows for a distinction to be made between friendly and enemy armed forces, on the one hand, and between armed forces and civilians, on the other hand.
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states:
12.1 The principle of distinction
159 Hostilities must be directed exclusively against combatants and military objectives. Respect for this rule is only possible if combatants and military objectives can be distinguished from protected persons and objects. Such means include wearing a uniform or at least openly bearing weapons while engaged in an attack.
In 2010, in its Report on IHL and Current Armed Conflicts, Switzerland’s Federal Council stated:
International humanitarian law establishes criteria for the granting of
combatant status. It is primarily for members of the armed forces of a party to the conflict but also for members of other militias. For this, combatants must carry their arms openly, be recognizable (generally by a uniform), be under a responsible command and act in conformity with international humanitarian law in their operations.

[footnotes in original omitted; emphasis in original]
Switzerland’s Basic Military Manual (1987) states: “The civilian population does not have the right to take up arms except in the case of a
levée en masse to resist an invader.”
The manual further states:
The civilian population of a non-occupied territory which,
en masse, takes up arms spontaneously at the approach of the enemy is entitled to commit acts of war, even if this population did not have time to organize itself, provided arms are carried openly and the laws and customs of war are respected.
Switzerland’s Basic Military Manual (1987) states:
Exceptionally, for example, in the case of guerrilla warfare, combatants are not obliged to wear a uniform or a distinctive sign. They are considered as members of the armed forces who have the right to prisoner-of-war status, provided they fight for a State or a liberation movement, within an organization which has a responsible command and a disciplinary system, and provided they carry their arms openly before and during an attack.
At the CDDH, Switzerland abstained in the vote on Article 42 of the draft Additional Protocol I (now Article 44) because it was afraid that “the article would only have the effect of doing away with the distinctions between combatants and civilians. The consequence would be that the adverse party could take draconian measures against civilians suspected of being combatants.”