Captain John Jacob joined the INA’s Suicide Squad. He was also enrolled into the INA’s Officer’s training school and the INA’s Intelligence wing.Following the war he became a member of the ex-INA committee, the Netaji Memorial Library, Netaji Hindi High School, Dakshina Bharata Hindi Prachar Sabha, Netaji Research Bureau, Indian Welfare Home and the Worker’s Education Association. He was later employed at the Chronicle English Daily Newspaper and as a Food Control & SIB Officer. Captain John Jacob continued to be an active spokesperson of the INA until his demise. He came forward to donate his INA uniform for display at the Indian HeritageCentre during his lifetime.