You're inquiring if you can reclaim 5 acres of agricultural land sold by your ex-serviceman father in 1998. Government-issued land to ex-servicemen often has restrictions on sale, typically requiring a 10-year period and sometimes a No Objection Certificate (NOC). If your father didn't follow the correct procedure, you might be able to challenge the sale deed in court, but there's a risk the land could be repossessed by the government. It's advisable to consult a lawyer with all relevant documents to assess your specific case and the land allotment policies of your state.