The Full Form of OROP is One Rank One Pension.

One Rank One Pension (OROP), or “same pension, for same rank, for same length of service, irrespective of the date of retirement”, is a longstanding demand of the Indian armed forces and veterans.^{:p 1} The demand for pay-pension equity, which underlies the OROP concept, was provoked by the exparte decision by the Indira Gandhi-led Indian National Congress (INC) government, in 1973, two years after the historic victory in the 1971 Bangladesh war, and shortly after Field Marshal SHFJ Manekshaw retired, to decrease armed forces pensions by 20–40 percent, and increase civilian pensions by 20 percent, without consulting armed forces headquarters.