Expressing his solidarity with the ex-servicemen, he said that he will be participating in the rally proposed to be held next month on the issue.
"They have given their entire life to the nation and now it is the duty of the nation to pay them back", Singh asserted.
In a statement issued here today, Amarinder said it was the worst of "betrayal" with the ex-servicemen of the country despite the previous UPA government having approved it.
The Congress leader disclosed that he had written to the Defence Minister before the budget seeking that the OROP should be announced without any delay.
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He said the Defence Minister had in his reply assured that the modalities were being worked out and the issue shall be settled soon.
"Now it is about five months, nothing has been done. Neither does the government appear to be intending to do anything," he added.
The scheme is estimated to cost around Rs 8,600 crore initially and subsequently several crore rupees annually.
Currently, all pre 2006 (the year the 6th pay panel recommendations became effective) pensioners receive lesser pension than not only their counterparts but also their juniors.