Four former service chiefs have written an open letter to President Pranab Mukherjee requesting his intervention in 'One Rank One Pension Scheme' for ex-servicemen. <br/><br/>The letter written by General SF Rodrigues (Retd), Admiral L Ramdas (Retd), Admiral Arun Prakash (Retd) and Admiral Sureesh Mehta (Retd) said that the denial of OROP is merely the last straw that has exhausted the veterans' patience. <br/><br/>It appears to be the culmination of a process by which successive Pay Commissions have been used to whittle down the financial and protocol status of the military over the years vis-a-vis their civilian counterparts, the letter said. <br/><br/>It said several factors in this regard have the potential to cause immense damage to India's military edifice and hence, to our national security.