There are two main uses of the emblems: the “protective use” and the “indicative use”.
First, the emblems are a visible sign in armed conflict of the protection given under international law to the medical services, equipment and buildings of the armed forces. That protection extends to certain humanitarian organizations who also work to relieve the suffering of the wounded, prisoners and civilians caught up in the conflict. This first use is usually referred to as “protective use”.
Second, National Crescent Societies around the world are allowed to use the emblems to identify themselves as part of a global network known as the International Red Cross and Red Crescent Movement. This use is called the “indicative use”.
The rules for both uses are very precise.
In armed conflicts, the protective emblem must be in red on a white background with no additions. It must be clearly displayed in a large format on protected buildings, such as hospitals and vehicles. Emblems on armbands and vests for protected personnel must also be clear and stand alone. A deliberate attack on a person, building or equipment carrying a protective emblem is a war crime under international law.
The indicative use by National Societies is different. National Societies may in peacetime make use of the name and emblem for their activities other than assistance to the medical service of the armed forces. The indicative use is therefore primarily a peacetime use. The emblems are in effect used as a logo. In wartime, National Societies may continue to use the indicative emblem, but only under the condition that it cannot be considered as implying the protection of the convention, i.e. that it cannot be confused with the protective emblem. To this end, the indicative emblem must be comparatively small in size and may not be placed on armlets or on the roofs of buildings.