Art.3. This organization is constituted of:
a) In the battle area, a field Commission of Control composed, at least, of three members, of whom two are representatives of the Powers protecting the interests of the belligerents, whereas the third member is elected, by common agreement, by the other two;
b) In sanitary towns and security towns, a fixed Commission of Control, composed in the same manner;
c) In all other cases, a Central Commission residing in the capital of each belligerent State and composed on the same lines.
Under all circumstances, one of the members of the Commission must compulsorily be a medical officer whenever it is a question of violations concerning the sick and wounded.