The ex-servicemen have already boycotted all official events being organised to celebrate the golden jubilee of the 1965 Indo-Pak war.
"The government has approved OROP but with so many riders that the OROP definition has been completely destroyed and has lost all its significance.
"What is the use of soldiers attending an event being organised for their honour even when their legitimate demands have not been met," Col (Retd) Anil Kaul, Media Advisor to the United Front of Ex-Servicemen told reporters here.
In a regret letter sent by Wing Commander (Retd) Vinod Nebb to the Rashtrapati Bhavan, he said, "I look towards you as our Supreme Commander and leader of the armed forces to ask why are you silent? Why would you invite me to an event, which to us veterans is a symbolic of our blood, sweat and dignity and play to the government's 'show' of respect to us and our achievement".
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The President's House is organising a high tea on September 22. Even though a section of veterans have boycotted, it is expected that many veterans would be attending.
"If not corrected, it will not only dilute the OROP but will also destroy its approved definition," the letter said.
The protesting veterans are insisting on pension revision every year instead of government's five years.
The veterans are also demanding that all those who have taken premature retirement must come under OROP.
The agitating veterans have also objected to the government taking the calendar year 2013 instead of financial year 2013-14 for fixing the base.
The ex-servicemen are also opposed to the formation of a one-man judicial commission and demand that it should be composed of three ex-servicemen, one serving officer and a bureaucrat.
Also, the deadline for the commission to come out with a report on the implementation of the OROP should be one month instead of six months as proposed by the government.
The protesting veterans have also demanded that the OROP should be independent of the Central Pay Commission and the concept should be in perpetuity.