DRRD

What is the full meaning of DRRD? What does DRRD stand for?

DRRD stands for;

DRRD Differential Reinforcement of Response Duration (psychology)
DRRD Department of Rural Rehabilitation and Development (Afghanistan)
DRRD Délégation Régionale aux Restructurations de Défense (French: Regional Delegation for Restructuring Defense)
DRRD Department of Radio Receiving Devices