Michael;
The AoS for the RCASC ran top left to bottom right (Green left/Red right). The AoS for the RASC ran top right to bottom left (Red left/Green right).
A lot of the Service Corps assets from Army level up were from the RASC, due to the simple fact that we did not have the resources to provide the units/formations required. Hope this answers your question.
Cheers
Examples of AoS RCASC and RASC: