Havaldar (retd) Ashok Singh Chauhan, was taken to the Army Research and Referral (R&R) hospital after suffering from "muscle atrophy", becoming the second veteran in as many days to be hospitalised.
Havaldar (retd) Major Singh, who is also on hunger strike since August 16, refused medical check-up.
Meanwhile, two more veterans, Maj (retd) Pyar Chand and Naik (retd) Uday Singh Rawat, joined the fast-unto-death protest, which entered its ninth day today, at Jantar Mantar.
The developments came as speculation mounted that government might announce the OROP by August 28, the golden jubilee of the 1965 War with Pakistan.
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Sources said back channel talks are underway between the government and the representatives of the ex-servicemen movement to sort out issues delaying OROP.
Meanwhile, in a twist, 'Voice of Ex-Servicemen Society', a group of retired jawans and other rank, started a parallel protest during which they accused the 'Union Front of Ex-Serviceman' (UFESM), the main organisation leading the OROP protest, of being an "officers group".
"Soldiers are the one who constitute more than 98 per cent in the forces and officers only constitute only 2 per cent. They did not put forth our representation while in talks with the government. How can we trust them? OROP should be implemented only after taking our demands into consideration," said Bir Bahadur Singh, President of the Voice of Ex-Servicemen Society.
The 'Union Front of Ex-Serviceman' rubbished the allegations saying the 'Voice of Ex-Servicemen Society' is lying.