Switzerland
Practice Relating to Rule 7. The Principle of Distinction between Civilian Objects and Military Objectives
Section B. Attacks against military objectives
Switzerland’s Basic Military Manual (1987) provides: “Troops can only direct their actions against military objectives.” It also provides: “Only military objectives, well specified and duly identified, may be attacked by bombardment or by projectiles fired from long-distance or having widespread destructive effects.”
Switzerland’s Aide-Memoire on the Ten Basic Rules of the Law of Armed Conflict (2005) states: “I exclusively engage combatants and military targets.”
Switzerland’s Regulation on Legal Bases for Conduct during an Engagement (2005) states: “Hostilities must be directed exclusively against combatants and military objectives.”
Switzerland’s ABC of International Humanitarian Law (2009) states:
Civilian objects
International humanitarian law distinguishes between Civilian objects and Military objectives, prohibiting acts of violence against the former. …
…
Distinction
International humanitarian law protects the civilian population and prohibits attacks against Civilians and Civilian objects. One of its ground rules is the principle of distinction: the parties to a conflict are obliged to conduct military operations exclusively against Military objectives and must therefore always distinguish between Civilians and Combatants as well as between Civilian objects and Military objectives. …
…
Military objectives
International humanitarian law distinguishes between
Civilian objects and military objectives. … Under international humanitarian law military personnel must at all times give full consideration to the nature of a potential target and opt exclusively for those that qualify as genuine military objectives.

[emphasis in original]
In 2010, in its Report on IHL and Current Armed Conflicts, Switzerland’s Federal Council stated: “Only attacks against military objectives come within the framework of international humanitarian law, even if these take the form of suicide attacks.”