I would agree with your assessment of R, D, and V (at least, that's where I was headed). As for the A, how about "Ausrichtung" - an alternative for "Organization"? IE: Reichs Ausrichtung der Deutschen Volksgesundheitsbewegung? Does someone have another idea, or know for sure?
As a side note, if find it fascinating to learn a organization would be allowed to exist some 4 and 1/2 years after the Nazi seizure of power, and hold meetings without using the swastika somewhere in its badge or a meeting tinnie...it is definitely saying the organization was non-political in nature!