Given the It’s not about the established names of the organizations, but of appellative expressions that identify informally to its members and, by extension, to the organizations themselves, it is advisable to write them in lower case, without it being necessary no highlighting like quotes or italics, as seen in the Spanish dictionary at the entrance blue helmets.
Also read: “Solo” and “este”, do they have accents or not in any case?
Capital initials are used for the name of the humanitarian agency formally named argentina White Helmets Commissionoften shortened as white helmets, which was created in 1994 and has the support of the UN. But to designate the members of this body, without any relation to the Syrian Civil Defense, the appropriate one is the lower case, as for example in “The story of the five white helmets that helped after Hurricane Katrina.”
Considering the above, in the previous examples it would have been preferable “Search operations in Syria continue with the participation of the white helmets”, “The white helmets are making an effort so that they can rescue those who are under the ruins” and “The convoy was attacked by demonstrators who had blocked the road in protest at the presence of the blue helmets.”
Also in RAE: Writing in capital letters is equivalent to SCREAMING, explains the RAE
The entrance White helmets and blue helmets, in lower case was first published on newspaper TODAY.