Talk:Seiran (631 Air Group)/@comment-68.146.133.92-20180605073351

The cited Geneva Article 39 applies to putting the Red Cross on medical facilities... and while there were "red cross on white field" requirements in the preceding Geneva Conventions (right back to 1864), the cited Article is from the 1949 Geneva Conventions, and so was negotiated after WWII.

I think what you want is the 1907 Hague Convention IV, Regulations Article 1.2, "to have a fixed distinctive emblem recognizable at a distance". 1929 Geneva relies on 1907 Hague for its definition of combatants.