Règle correspondante
Practice Relating to Rule 29. Medical Transports
Section B. Respect for and protection of medical aircraft
Guinea’s Soldier’s Manual (2010), under the heading “Distinctive signs”, shows an image of a helicopter with a red crescent on a white ground and states: “Let these … aircraft move around and do not enter them.” 
Guinea, Soldier’s Manual, Ministry of National Defence, 2010, p. 14.