Card 3 shows the Taube, which appears on several other cards in this collection. This same image is card 3 in the museum's series Campagne 1914-1916, this time with just the red cross logo and the AOG logo on the address side.
Card 24 was issued afer the Visé regulations of 1915. Boige identifies as printer and publisher of this card. I haven't seen the MR logo elsewhere, I did wonder if this was a pun on Musée Armée, but I think not!